I'm down to one neon in my tank. When he passes away, should I do a 100% water change and bleach everything in the tank in case there's some sort of residual harmful bacteria from any illness that might have been claiming my neons? I want to start over (with same tank, filter, setup) but with a heartier breed. I'm looking for small, bright (I have a penchant for red and/or blue fish), schooling, relatively hearty fish. Any suggestions?