Scolymia Coral Care Guide for Beginners
Learn how to care for scolymia corals with proper lighting, water flow, feeding, and placement tips. A practical guide to keeping scolymia corals healthy and growing in reef aquariums.
Scolymia coral is a single-polyp LPS coral with a round, fleshy body and a heavy skeleton underneath. Most hobbyists keep it for its open, inflated shape and clean color patterns rather than fast growth.
A healthy Scolymia coral usually looks full during the day, with tissue expanding over the skeleton and a visible mouth in the center. Its color and shape can shift depending on light, flow, feeding, nutrients, and how much stress the coral has been through.
Scolymia corals tend to be hardy once settled, but they do not like being blasted with flow, shaded too heavily, or moved around often. Their tissue is thick but delicate, and damage near the edge can lead to recession if conditions are unstable.
Note: Scolymia coral needs space. It is not the most aggressive coral in the tank, but it can be damaged by nearby stinging corals, rough rock, or sand constantly blowing against its tissue.
Lighting Requirements
Scolymia corals prefer low to moderate lighting in most reef tanks. They often do best under stable, indirect light rather than intense light placed directly above them.
A good starting point is the lower part of the tank or the sandbed. Once the coral remains inflated and shows steady color, it can be adjusted slowly if needed.
When lighting is too strong, Scolymia coral may retract, bleach, or keep its tissue pulled tight against the skeleton. When lighting is too weak, it may stay alive but lose some fullness and grow very slowly.
Flow
Scolymia corals usually prefer low to moderate flow. The flow should move gently around the coral without pushing the tissue hard in one direction.
When flow becomes too strong, the coral may retract or develop irritated edges. The soft tissue can rub against the skeleton, which often leads to small injuries over time.
Gentle, indirect flow is usually the safest choice. The coral should have enough movement to keep detritus from settling, but not so much that the polyp stays folded or tight.
Placement
Scolymia coral is usually placed on the sandbed. This protects the fleshy tissue from sharp rock and gives the coral room to expand naturally.
If placed on rockwork, the surface should be flat and stable. A Scolymia coral should not wobble, lean into rough edges, or sit where snails and hermit crabs can easily knock it over.
Once the coral settles and expands consistently, it is better to avoid moving it. Scolymia corals often respond poorly to repeated changes in light, flow, and handling.
Aggression
Scolymia coral is not usually highly aggressive, but it still needs space from other corals. Its own sting is limited, yet nearby corals can damage it quickly.
Euphyllia, galaxea, favia, chalices, and other corals with stronger stings should not be placed close to a Scolymia coral. Even brief contact can cause tissue damage.
The safest approach is to give the coral enough open space around its full expanded size. In most cases, a few inches of clearance helps prevent nighttime stings and accidental contact.
Feeding Scolymia Corals
Scolymia corals usually respond well to feeding. They can capture small meaty foods when their feeding tentacles are out, often after lights dim or when food is in the water.
Small pieces of mysis, chopped seafood, or soft pellet-style coral foods can work well. Food should land near the mouth without being forced into the coral.
Feeding once or twice a week is usually enough. Heavy feeding can raise nutrients and irritate the tank if uneaten food settles around the coral.
Once the Scolymia coral shows a strong feeding response and stays inflated after meals, feeding can support tissue fullness and recovery. It should not be used to compensate for unstable water or poor placement.
Water Parameters
Recommended Water Parameters for Scolymia Coral
| Parameter | Recommended Range |
|---|---|
|
76–80°F |
|
1.025–1.026 SG |
|
8.0–8.4 |
|
8–9 dKH |
|
400–450 ppm |
|
1250–1400 ppm |
|
0.03–0.10 ppm |
|
5–15 ppm |
Scolymia corals prefer stable reef parameters. Sudden changes in alkalinity, salinity, or temperature can cause retraction, tissue recession, or a weak feeding response.
Moderate nutrients are usually acceptable. Very low nutrients can make the coral look pale, while high nutrients can encourage algae and bacterial problems around the skeleton.
Scolymia Coral Growth and Spreading
Scolymia coral is a slow-growing coral. It does not spread across rock or form new heads like many other LPS corals. Most pieces stay as a single large polyp.
Growth usually shows as thicker tissue, better inflation, stronger color, and a slightly larger skeleton over time. In most tanks, changes are gradual.
Fragging Scolymia coral is generally not recommended for hobbyists. Since it is usually a single-polyp coral, cutting it can cause serious tissue damage and long recovery times.
If a damaged Scolymia coral needs to recover, stable conditions matter more than extra handling. Lower stress, gentle flow, moderate light, and careful feeding usually give it the best chance to settle.
Frequently Asked Question
Yes, scolymia coral is commonly placed on the sandbed. The sandbed protects the fleshy tissue from sharp rock and gives the coral room to expand. Make sure sand is not constantly blowing onto the coral.
Scolymia coral can be beginner friendly in a stable reef tank, but it is not the best coral for a brand-new system. It prefers consistent salinity, alkalinity, nutrients, and gentle flow. Once the tank is stable, care is usually straightforward.
A scolymia coral may shrink because of strong flow, strong light, unstable parameters, or irritation from nearby corals. Check placement first, especially if the tissue is being pushed or folded. It may take several days to expand again after stress is corrected.
Scolymia coral does not need heavy feeding, but it usually benefits from occasional small feedings. Small meaty foods can help maintain tissue fullness and support recovery. Feeding once or twice a week is enough in most tanks.
It is better to keep scolymia coral from touching other corals. Its tissue can be damaged by stings, rubbing, or pressure from nearby colonies. Leave enough space for full expansion.
Scolymia coral usually does best in low to moderate light. Too much light can cause the tissue to retract or bleach. If the coral was kept under lower light before, any increase should be gradual.
Scolymia coral is not commonly fragged because it is usually a single-polyp coral. Cutting through the polyp can lead to tissue damage and slow healing. It is better treated as a whole coral rather than a coral meant for regular fragging.
