White blob in rock cave

[chunkeylover59]

Hello!
I noticed this white blobby stuff in my rock cave about 6 months ago, but couldn't find much info on it so I cleaned it out to be safe. It appears its back now though, and after doing some more research it sounds like it could just be sponged/filter feeders? Posting here to get confirmation one way or the other, and what course of action to take if any is needed.

My Tank parameters are below. I'm aware that my parameters are fairly high; They jumped up a while ago and I've been actively trying to combat them for several weeks. That's probably a topic for another thread though haha, and this was around long before that.

Thanks in advance to all those who help!

Some additional information:
- It has never spread from this cave
- I've never noticed anything shooting out, or coming out of the white blobs
- I think I didn't accidentally touch it before and remember it feeling "spongey" or "bouncy"

Tank Parameters:
- 28 gal
- Nitrates 20
- Phosphates .5
- Alk 7.8
- Salinity .27
- Temp 26c/78.8f

 

[RedReefer]

Sponge. Leave it. It's harmless.

 

[chunkeylover59]

Thank you! That's what I was hoping for