Thin layer of sponge in sump baffles?

[Nicholo]

I had a thin layer (.5") of very porous sponge (e.g., the sort of sponge you would get with an aquaclear HOB power filter) in the baffles in my 'fuge. I read that nitrates and phosphates could build up in sponges and that they shouldn't be in a reef tank. Does this hold even for this thin layer of sponge? The sponges have a bunch of 'pods running through them, so I was wondering if it was all that different from porous live rock, given that there is a lot of flow through these sponges and creatures are living in them. Thanks for your thoughts...

[bertoni]

You might see some elevated nitrate from the layer of sponge, but if you're not measuring a problem, I wouldn't worry about it.

[Entropy]

I agree with Jonathan. As long as your not having nitrate problems, don't worry about it. I would clean it often though, and keep an eye on the nitrates just in case. The same is true with canister filters and filter socks IMO.

[Nicholo]

Thanks as always, guys. :)