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so the sponges attached to the power heads are not enough for the biological filtration? So fish only tank is not a really good idea then?

Hi all, First of all, this is a great forum, I've been reading and learning a lot from other members. I've been keeping a 2' nano reef tank for almost half a year now, and everything's been going very well. I'm setting up a 2nd marine tank, but fish only, without live rock or coral. Here's...