Ok, so we went to the LFS yesterday and the lady there told us to put more fish in the tank, we put some neons in five, the ones with the red stripes down them, not the blue ones. They are fine. We've also added two plants to get some good bacteria in there and more oxygen. The lady said that the orange platy might be pecking at the white one cos the orange one was a female and the white one was a male so she suggested adding another female so we got another one, a blue mickey mouse female. Everything was fine and we put the white one back in the main tank after keeping it separated. I noticed in the sciv there was normal brown poo so that seems ok. The orange one seems to be leaving it alone now thank god but I'm still keeping an eye on it. We also got a test kit and the ph was ok but the nitrite was in danger level so we did a 50% water change yesterday and tested it again and it was light pink but then this morning it was back to bright pink so we rang the lady at the LFS and she said to do a 50% water change, feed the fish and then not feed them for 3 days. Does this sound right to you. Also the white one is still swimming funny, i've read up on all the info on swimbladder but the white one doesn't have any symptoms, it can swim up and down with no problem, it can float in the middle of the tank fine but when it swims fast it looks like its pissed and instead of dartin forward straight its body slight tilts and another thing i've noticed with it is its fins are clamped not like the other two, any advice would be appreciated x