What's this

[gareth.hubbarde]

What is this white stuff growing under my acan? It's doing very well, currently 10 heads up from 7 when bought, just noticed all of this white underneath it.

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[billdogg]

branching sponge. Filter feeder, generally harmless, and can be easily trimmed if it grows too large.

 

[lionfish300]

Sponges

 

[mansorinc]

Sponges are harmless, I would just let it be and trim if needed


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[Sk8r]

I had a blue version of that in a prior tank that just ran a very pleasing network over rock, hither and yon. I'd love to have it in my current one.