anybody got an idea what this is?

[larrygr]

thought it was algae but i see feeding tubes

 

[mr.reeferman]

nope but it looks cool look forward to finding out myself

 

[kv69]

looks like a sponge

 

[Tahoe61]

Sponge and harmless.

 

[MikeyB]

Yep, i'd say a sponge for sure. I have one in my tank that's pretty similiar to that.

 

[Preyou]

I agree with the previous two posts. I think that they call them pineapple sponges and they are a good sign that your water parameters have stabilized.

 

[mr.reeferman]

name him spongebob he lives in a pineapple lol