Goniopora Care Guide: Light, Flow, Feeding and Why It Won’t Open

For three months the goniopora opened every morning, a ball of flowers swaying in the current. Then one week it stayed shut, and a month later it was bare skeleton. For decades that was the normal story with this coral, and it is why the coral still has a bad name.

The story has changed, mostly because of where gonios come from now. This guide covers what goniopora needs from your tank, what the research actually shows about feeding, and what to check first when one stops opening.

Why goniopora earned its reputation

Goniopora, the flowerpot coral, was the coral people were told not to buy. Justin Credabel summed up the old advice in Reefkeeping Magazine in 2005: they’re pretty, but “they won’t make it past a year.” Tidal Gardens describes the classic pattern. The colony looks healthy until about the three to six month mark, then “suddenly refuses to open up.”

Most of those colonies were wild-collected, long-polyp species like Goniopora stokesi, shipped a long way into tanks that ran lean on food. Julian Sprung wrote in 2002 that G. stokesi “apparently do slowly starve to death in aquariums.” A 2021 feeding study cites earlier research putting aquarium mortality as high as 95%.

Why farmed goniopora do better

An aquacultured frag has spent its whole life under aquarium lights, eating aquarium food, in aquarium water. Reef Builders put it plainly in 2020: “Virtually all of our personal success with flowerpot corals is the result of starting with fragged corals.” Fragging also separates the coral from the worms and other animals that live in a wild colony’s porous skeleton. Reef Builders believes those hitchhikers played a part in the old losses. That part is their opinion, and nobody has tested it.

The lab evidence points the same way. In the 2021 study by Ding, Sun and Pan, captive Goniopora columna had 100% survival in every group over eight weeks, and the best-fed corals went from about 5 polyps to 40 or more in two months.

Goniopora, micro goniopora and alveopora

Count the tentacles. A goniopora polyp has 24. An alveopora polyp has 12. That split comes from the 2014 molecular study of the family by Kitano and colleagues, and it is the quickest way to tell the two apart in the tank. If you want an alveopora, those are here.

“Micro goniopora” is a trade name for short-polyp flowerpots. Many of them are Bernardpora stutchburyi, a species the same 2014 study moved out of Goniopora into its own genus. It behaves differently. Credabel found that G. stutchburyi “thrives in high light and low nutrient environments” with moderate to high flow, close to the opposite of the long-polyp types. The label does not guarantee the species, so ask what you are buying.

	Long-polyp goniopora	Micro goniopora / Bernardpora
Polyps	Long, flower-like, 24 tentacles	Short, tapered
Light	Moderate, about 75 to 150 PAR	Tolerates brighter light
Flow	Moderate, indirect	Moderate to strong
Nutrients	Measurable nitrate and phosphate	Handles leaner water
Difficulty	Intermediate	The easiest way in

Light: start around 100 PAR

Most farms keep goniopora in moderate light. Tidal Gardens recommends 75 to 125 PAR, Queen City Corals starts at 75 to 125, and Top Shelf Aquatics says 100 to 200 for most species. Tidal Gardens has kept them anywhere from about 50 PAR to over 200 PAR, which tells you the coral can adapt if the change is slow.

Start a new frag in the lower half of that range, in the middle of the tank, and move it up over weeks, not days. Too much light shows up as bleaching. Too little shows up as the coral turning brown.

Flow: sway, not thrash

The polyps should sway back and forth. If they are whipping around or folded flat, the flow is too strong and the coral will start pulling in. If the water barely moves, detritus settles between the polyps and chokes them, as Reef Builders points out. Put it where the flow is moderate, indirect and changes direction, not in front of a powerhead.

Short-polyp micro gonios handle stronger flow than the long-polyp types, which is why some vendors list “strong” flow for them.

Water: steady alkalinity, measurable nutrients

Parameter	Target
Alkalinity	8 to 9 dKH, held steady
Calcium	400 to 450 ppm
Magnesium	1300 to 1350 ppm
Nitrate	5 to 20 ppm
Phosphate	0.03 to 0.1 ppm
Temperature	76 to 78°F, no spikes
Salinity	About 1.026

The exact alkalinity number matters less than holding it still. Credabel kept healthy colonies anywhere from 6 to 11 dKH, and Queen City Corals ties tissue recession to alkalinity swings. Pick your number and keep it there.

Nutrients are where gonios part ways with SPS. A tank stripped to zero nitrate and phosphate is the wrong home. Queen City Corals puts it well: gonios “do not need a dirty aquarium,” but there is “a difference between available nutrients and poor water quality.” Aim for nitrate and phosphate you can measure, and keep them steady.

Keep the temperature stable through the summer. In a 2026 field study near Shenzhen, the small-polyp coral group that includes goniopora lost more cover after a bleaching event than the larger-polyp corals did.

Feeding: what the evidence shows

Goniopora does eat. In the 2021 study, researchers found microalgae and yeast cells inside the corals’ body cavities an hour after feeding, and the corals on a protein and fatty acid diet grew the most polyps. Their digestive enzyme activity peaked between 6 AM and noon, which hints that a morning feeding may work best. That is one study on one species, so treat it as a lead, not a rule.

Light still does most of the work. The 2026 study estimated that wild corals in goniopora’s group get about 87% of their nutrition from light. Feeding is what separates a coral that holds on from one that grows.

What keepers who grow them do is consistent: fine food, a couple of times a week, with the pumps off. Reef Builders recommends phytoplankton and zooplankton because the mouths are very small. Top Shelf Aquatics feeds two to three times a week and turns the flow off for 15 to 20 minutes. Tidal Gardens mixes powdered plankton and applies it with a turkey baster. No study has tested amino acids on goniopora, so dosing them is a judgment call.

Watch who else is eating. Credabel noted that snails, shrimp, serpent stars and fish will help themselves to the food, and shrimp can tear tissue while they do it. Our guide to spot feeding corals covers the technique.

Give it room

Goniopora is more aggressive than it looks. Some varieties grow sweeper tentacles several inches long, so leave 3 to 4 inches of open space around the fully open colony. Keep it away from torches, hammers, galaxea and fast-spreading zoanthids, and don’t assume two gonios will get along with each other.

They also fight with chemistry. In a study Eric Borneman described, water from 8 of 10 goniopora colonies was toxic to at least one of the test species. His advice for these compounds is activated carbon and regular water changes.

When goniopora won’t open

What you see	Likely cause	What to do
New arrival closed for a few days	Shipping stress	Low light, moderate flow, and about a week of patience
Pale, bleached color	Too much light	Lower the light or move the coral down
Turning brown	Too little light	Raise it slowly
Polyps whipping or flattened	Flow too strong	Move it out of the direct stream
Tissue pulling back from the base	Alkalinity or salinity swings, or physical damage	Test alkalinity daily for a week and hold it steady
Closed on the side facing a neighbor	Stinging or chemical warfare	Give it 3 to 4 inches of space and run carbon
Fine for months, then slowly shrinking	Not enough food, or nutrients near zero	Feed two to three times a week and let nitrate and phosphate read above zero

If it is a brand new coral, read why a new coral won’t open after shipping before you change anything.

After shipping: acclimate first, dip later

Don’t dip a new goniopora the moment it arrives. Reef Builders recommends giving it a few days to adjust first, and World Wide Corals waits 10 to 24 hours after any new coral goes in before dipping. When you do dip, measure exactly what the label says. World Wide Corals calls improper dipping the number one cause of dead corals.

Start it low in the tank with the lights turned down, then raise them slowly. Top Shelf starts new corals at 50% intensity and adds 10% a week over six weeks.

Pests and disease

Brown jelly

A brown, slimy film on receding tissue, caused by ciliates. Pull the coral, siphon the jelly off, cut away the dead tissue, dip it, and keep it off the sand while it recovers. Some hobbyists use prescription antibiotic baths. We don’t recommend it.

Nudibranchs

Phestilla goniophaga, described in 2020, eats goniopora in the wild and mimics its polyps. There is no confirmed report of it in a home aquarium, but it is one more reason to inspect and dip wild-collected colonies.

Is goniopora a good beginner coral?

Not as a first coral. World Wide Corals recommends them for intermediate and advanced hobbyists, and Tidal Gardens calls them among the most delicate corals in the hobby. A goniopora is a good fit when:

• the tank has been running and stable for months
• alkalinity holds steady and nitrate and phosphate read above zero
• you will target feed two or three times a week
• there are 3 to 4 inches of open space for it
• it is an aquacultured frag, not a wild long-polyp colony

If you want an easier start, a micro goniopora is the best way in. Our list of best beginner corals has other options for a newer tank.

Quick answers

Is goniopora LPS or SPS?

It is sold as LPS. Genetically it sits in the family Poritidae, next to Porites.

How fast does goniopora grow?

Reports vary, and growth follows feeding. Reef Builders says micro gonios grow “pretty fast if provided copious amounts of food,” while other keepers call gonios slow. In the 2021 study, the best-fed corals grew the fastest.

Can two goniopora touch?

Don’t count on it. Give each colony its own space.

Sources

• Ding, Sun and Pan (2021), feeding study on Goniopora columna, Animals 11:3009
• Kitano et al. (2014), molecular phylogeny of Poritidae, PLOS ONE
• Julian Sprung (2002), captive husbandry of Goniopora
• Justin Credabel (2005), Reefkeeping Magazine
• Eric Borneman (2002), Goniopora revisited
• Reef Builders, introduction to goniopora care (2025) and flowerpots, Bernardpora and alveopora (2020)
• Tidal Gardens, goniopora coral care

The Underwater Gardener grows aquacultured corals in Key West, Florida (FL Aquaculture Certificate #AQ0254072). Our corals are raised under stable reef lighting in our own systems, so they arrive already adapted to a well-run tank. Corals ship UPS Next Day Air every Tuesday and Wednesday.