Worm like things on Chalice?

Brah02 · Apr 4, 2026

I have a chalice that randomly started dying, so I dipped it in some iodine. Then after about 30 minutes these worm like things started coming out. Is this a concern? Do they kill coral and if so do I keep the chalice out of the tank? If it was infected I’m sure others are as well, is there something I should do in the tank? No significant water parameter changes at all tank is pretty steady.

20260404_135301_E8FCC9F8-8B3A-44F6-B353-C096D53D2BCF.png

20260404_135301_94CB4FF6-78F1-4930-8A76-EAD44EB84300.png

StartingATank · Apr 4, 2026

Mesamenterial filaments?

Chela101 · Apr 5, 2026

Those things look gnarly

Marine Betta · Apr 5, 2026

Brah02 said:
I have a chalice that randomly started dying, so I dipped it in some iodine. Then after about 30 minutes these worm like things started coming out. Is this a concern? Do they kill coral and if so do I keep the chalice out of the tank? If it was infected I’m sure others are as well, is there something I should do in the tank? No significant water parameter changes at all tank is pretty steady.

Those look like mesenterial filaments to me which are often released as a stress response or feeding response. In this case, it was probably the iodine dip. What are your parameters? Any tank mates that could be picking at it, or nearby corals that could be stinging it?