Was you rock already cured?
This is exactly how me and a roomie started a year ago, 15g, then a 33, then a 50 cube, and now a 75rr! Pretty sure this hobby is worse then crack!
Hopefully you don't have the same issue but if you do feel the need to upgrade definitely go 75g minimum.
Good luck! As i see it you pretty much started a 10g hdtv!
