Well right now I have a cory cat and a scissortail in a 2.5g minibow (don't flame, I know they shouldn't be in it!) but when I had the mass fish death I threw everything out and moved the two lone survivors into the already cycled 2.5g to await a new set up (and bought another 2.5g minibow to move my
betta to. I divided the old water in half and added new water and fiddled around with the filters and cartridges to cycle them).
The death of the previous tank is a long story, but to make it short my 20g sprung a leak in the middle of the night. When we woke up the following morning there was about 2 inches of water left and 8 dead fish. The hard wood floors were destroyed as well. So I'm going to move Fred & Ethel into the 29g once it is set up.
But for now I have 1 2.5 with a betta and 1 2.5 with a scissortail and a cory cat. Whisper Micro Filters.