ok since my 20 gallon didnt turn out well....(we had a storm and we lost power so the male died...not sure y but he was belly up...) and the female was then placed it her own 10 gallon hex and jumper out while on vacation it jsut didnt work..ow i would like to try to breed the bettas again so i jsut got a very colorful crowntail betta and he is building a bubblenest with out a mirror or the sight of a female so this is promising...ok so my question is could i use a 5.5 gallon for this? my mom said no more tanks and that is the only one i have that i could use (well its that or 2 one gallon aquariums...) so anyone think this will work? o and i've brushed up on my reasearch so i remember most of the general info now so ty for helping me 