It’s not uncommon for torch corals to retract after being stressed. Here’s what you can do to help it recover and assess if there’s a bigger issue:
1. Inspect the Coral:
- Look for tissue damage: Check if there’s tissue recession near the base of the head. If the skeleton is exposed, monitor for signs of infection or further tissue loss.
- Check for brown jelly disease: This is a common infection in stressed Euphyllia corals. If you notice a slimy, brown substance, you’ll need to act quickly to save the coral.
2. Double-Check Water Parameters:
- Alkalinity: 8-12 dKH
- Calcium: 400-450 ppm
- Magnesium: 1250-1350 ppm
- Nitrate: 5-10 ppm
- Phosphate: 0.01-0.03 ppm
- Temperature: 76-80°F
- Salinity: 1.025-1.026 specific gravity
3. Double-Check Placement and Flow:
- Flow: Ensure it’s in a moderate flow area. Too much flow can irritate the coral, while too little might not keep it clean.
- Lighting: Avoid sudden changes in light intensity. Torch corals prefer moderate to high light.
Correct any imbalances gradually to avoid further stress.
4. Feeding:
- If it starts extending its tentacles again, offer small, meaty foods like mysis shrimp to support its recovery. This isn't necessary, but see if it helps.
5. Patience:
- It’s normal for torch corals to take a while to recover from stress. Keep monitoring it, but don’t disturb it further.
If it shows signs of recovery (e.g., slight tentacle extension), that’s a good sign. However, if the coral begins to deteriorate further, or if you’re unsure about its condition, isolating it in a quarantine tank might prevent the spread of disease to other corals.
Do you have any pictures?