About Stock: Platygyra Maze Corals and Their Ridged Brain Pattern

Walk along any wall of large polyp stony corals in a display tank and Platygyra is usually the one that looks like a topographic map. Instead of round separated corallites, this genus grows in continuous meandering ridges and valleys, which is exactly why it earned the common name maze coral. It is a genus that rewards a slow, attentive keeper without demanding advanced skills, and it happens to be one of the more forgiving LPS options for someone building confidence with large polyp corals.

Reading the Maze Pattern

Platygyra colonies form a network of fused walls rather than individual mouths sitting in their own cups. The septa, those little vertical ridges inside each valley, run in tight, closely packed lines that give the coral its brain-like texture. Colour often sits in two tones at once, a base wall colour and a contrasting line running along the ridge tops. The gold and green combination seen in aquacultured frags is a good example of this two-tone effect, and it is part of why the genus photographs so well under blue-heavy lighting.

Growth is encrusting rather than domed. A frag will spread outward across a plug or rock face before it starts to build height, which makes Platygyra a useful coral for covering bare rock or filling gaps between other LPS colonies on an aquascape.

Platygyra Versus Favia: What Actually Differs

New reefkeepers often lump Platygyra in with Favia because both are chunky, fleshy LPS corals that tolerate a similar range of light and flow. The difference is in the corallite structure. Favia has distinct, separated circular corallites, each with its own visible wall, so the surface looks like a cluster of individual cups even when the colony is large. Platygyra corallites share walls and run together in continuous grooves, with no clear separation between one mouth and the next. Under normal room lighting the two can look similar from across a shop floor, but under a torch or macro lens the maze versus cup distinction becomes obvious immediately.

Lighting, Flow and Placement

Platygyra sits comfortably in the middle of the LPS lighting range. Somewhere between 100 and 200 PAR suits most colonies well, and colour tends to hold up better under moderate intensity than under the very high output settings some SPS keepers run. Flow should be steady rather than forceful. A gentle to moderate current that keeps detritus from settling in the valleys is enough, since heavy direct flow can strip the thin tissue layer covering the skeleton. Give a frag some breathing room on the rockwork too, because the encrusting growth habit means neighbouring corals within a few centimetres can end up fused or stung as the colony spreads.

Feeding is straightforward. Platygyra will take small meaty foods at night when its polyps extend, and broadcast feeding with a quality reef blend a couple of times a week supports growth alongside the light it captures during the day.

Quick Parameter Guide

• Tank size: workable in nano systems from around 100 litres up, though it will eventually need room to spread
• Lighting: 100 to 200 PAR, tolerant of a wide range once acclimated slowly
• Flow: low to moderate, indirect rather than blasting
• Water parameters: stable calcium, alkalinity and magnesium within standard reef ranges, with steady temperature around 24 to 26 degrees Celsius
• Temperament: can sting neighbours as it encrusts, so leave clearance space
• Feeding: appreciates target feeding at night, otherwise photosynthetic

Why It Suits Newer Reefkeepers

Platygyra tolerates the small swings in temperature and lighting that happen while a tank is still being dialled in, and it signals stress fairly clearly through bleaching or tissue recession rather than dying suddenly. That feedback loop makes it a genuinely educational coral to keep early on, because mistakes tend to show up as slow colour loss you can catch and correct rather than an overnight loss.

Aquacultured Platygyra frags, including gold and green colour forms, turn up in our LPS range from time to time. Since what is on hand shifts with each shipment, check out our stock list at our LPS coral collection to see current maze coral options, and browse fragging tools or coral food while you are there if you are setting up feeding routines for your LPS.