What a LONG journey my betta and I have been on since I decided to give him a 10 gallon tank. Ugh! So it was a classic case of "haste makes waste". I put him in the new tank from his 5 gallon tank too soon without checking the water levels etc.. After a few hours he started acting lethargic and seemed to be laying in bottom of tank without any movement. I quickly went to pet store and bought a kit to check water. It was WAY off. Had to use PH up and down until finally it improved. He was a little better but then went downhill quick. He then got stuck in filter. I thankfully was home and watching him so I saved him. I felt the tank and swore the water temp was too cold even though the chick at the pet store told me I didn't need a water heater since I lived in Florida. She was wrong!!! I bought thermometer and heater. It was too cold indeed. I prayed and prayed and prayed for him to survive. After a while he got his spunk back!! Started darting around, playing etc....BUT when I got home from work his tail was all tore up and shredding off as he swam. At this point he barely has a tail left!!!. I put some betta revive in the water (glad I had some on hand) and just keep watching him. Is there anything else I can do? And what caused this??? Wow have I learned some lessons the hard way. Thank GOD my baby made it. I feel awful putting him through this!!!