Hydroids? Sponge?

pythpyth · 2026-09-23T06:48:31-0400

Hi all!

Does anyone got an idea what these are?

Thanks for replying!

EnterName · 2026-09-23T07:21:30-0400

Looks like some Botryllus (or related) tunicates to me.

Tahoe61 · 2026-09-23T08:18:44-0400

Tunicates.

pythpyth · 2026-09-24T07:23:52-0400

EnterName said:
Looks like some Botryllus (or related) tunicates to me.

Wow! Never thought about that, there are so many though!

EnterName · 2026-09-24T07:58:12-0400

pythpyth said:
EnterName said:

Looks like some Botryllus (or related) tunicates to me.

Click to expand...

Wow! Never thought about that, there are so many though!

Are you feeding a lot, like plankton or powdered coral food? These things are filter feeders, maybe it's just a good spot for them to grow. I'm actually not sure if some of them can spread too aggressively so keep a photo so you can track how fast they spread.