At my LFS, they had used 20 gallons for a great buy. I got one and I plan on doing a sorority/community. So when I said I would divide a ten gallon, still going to do by the way, and put Tanya in the middle. I will just put her in the sorority and put three males, Apollo, Pirate, and possibly Crimson (still not sure what he/she is) in the ten gallon.