<a href=showthread.php?s=&postid=9441336#post9441336 target=_blank>Originally posted</a> by Kinetic
I would first see what you will keep in a 5 gallon. I went skimmerless in a 4.5 gallon tank, and it did ok with no fish and a bunch of zoos. Big water changes (meaning like a gallon or two, haha) did the trick.
But then I wanted to keep a dwarf angler, so I put in a tunze nano skimmer. It's only 4" x 2", so it's TINY, and it works REALLY well. Overkill for the 5 gallon, but you can keep SPS with some really poopy fish =)
So if you do want a high quality skimmer that is small, tunze nano skimmer is what I'd recommend. It's also absolutely silent.
But I think you can get away without a skimmer in a 5g, given you do consistent water changes, which I'm sure you do, AND if you're not keeping any crazy amount of fish or high bioload fish.
BTW I've heard the fission are terrible =( nano-reef dot com will tell you all about it.