Whis is this?

Finding all kinds of interesting stuff on my rocks now. What might this be?

 

Look like colonial tunicates to me.

 

yep, i would guess so as well

 

tunicates i reckon

 

Yeah, I'm going to have to agree with the colonial tunicate id.

 

/agree

 

I haven't really looked them up yet, but... good? Bad? Ugly?

 

Good but not likely to survive long in your tank. They are filter feeders and it's rare that our tanks have enough food in the water to keep them alive.

 

I just did a quick google search and I found some sites saying that those are really hard to keep alive, but if they thrive in your tank it means your tank is very healthy, water is great, etc. and that they are good filter feeders.

I don't know anything about them, that's just what I found online.