Euphyllia Troubleshooting: BJD, Brown Jelly, and Bailout

When Your Euphyllia Aren't Happy

Nothing ruins a morning like seeing a prized torch coral looking wrong. Retracted polyps, brown stringy gunk, skeleton showing... But most Euphyllia problems are fixable when caught early.

Brown Jelly Disease (BJD)

What it looks like: A brown, slimy, jelly-like substance covering the coral tissue. Often starts at the base and spreads upward. Smells rotten.

What causes it: Bacterial infection, usually Vibrio species. Can be triggered by stress, injury, or introduced with a new coral. It's contagious.

What to do:

Remove the affected coral immediately from the display tank
Blow off the jelly with a turkey baster in a separate container of tank water
Dip in coral dip (Coral Rx, Lugol's iodine, or similar)
Frag away any healthy sections if the infection hasn't spread everywhere
Quarantine in a separate system or mesh container in the sump

Speed is everything with BJD. Hours matter.

Bailout (Polyp Ejection)

What it looks like: The coral ejects its polyps from the skeleton. Little polyp blobs float around or sit on the sandbed.

What causes it: Extreme stress — rapid parameter swings, aggressive tankmates, chemical warfare, or a bad reaction to a new environment.

What to do: Collect ejected polyps gently and place them on rubble in a low-flow area. Some will reattach. Investigate the stress cause — check parameters, look for neighbour aggression.

Not Opening / Staying Retracted

The most common complaint and usually the least serious. Common causes:

Flow too strong: Reduce direct flow or redirect it
Light too intense: Especially after a new light or moving the coral higher
Water parameter shift: Check alk, calcium, and temperature
Pest presence: Euphyllia eating flatworms, nudibranchs, or nearby Aiptasia
Neighbouring aggression: Something stung it overnight
Just being moody: Sometimes they retract for a day or two and then open back up

If it's been more than 3–4 days, start investigating systematically.

Tissue Recession

Skeleton becoming visible at the base or edges. Usually alkalinity instability or sudden changes. Stabilise parameters gently — don't shock-correct. If it continues despite stable params, dip to rule out pests.

Prevention Is Better Than Cure

Quarantine new Euphyllia for 2–4 weeks before adding to the display
Dip all new corals to catch flatworms and pests
Maintain stable parameters — consistency matters more than hitting exact numbers
Don't overcrowd — give Euphyllia generous space

What Euphyllia issues have others dealt with? Any tips on early detection?