I have had a nano and a biocube. I LOVE the biocube. It is a 29 gal and it has two intakes and two outputs and the fans are in the top like the nano. I like my nano, no problems although I did upgrade the pump when I used it for a reef. I DID however have an original nano that cracked and leaked the entire tank of water (Disaster!) My new one has been fine for about a year, although the moonlights conked out after about 6 months. I would go with the
bio cube. I have heard NOT good things about the Aquapod, although I am sure there are plenty of people who love thiers and I have no personal experience with them.