I posted a few days ago about my girlfriend and mines betta that had not been eating and acting kinda funny. well girlfriend went out of town this weekend for a few days (left friday came back sunday) and before she left we fed both of the bettas we have and cleaned both tanks and when she came back the one that wasnt acting right was dead. we talked to the people at Petco and they said it could have been from bloat or dropsy but were not sure exactly what it was. well we decided to get another betta that day and after cleaning everything from the tank out thoroughly we put the betta in the tank. at first she seemed happy and swam around getting use to the new tank but then after the first night she started acting exactly the same way the other fish did. she wont eat..if anything she puts the pellets in her mouth and spits them out and sits at the top of the tank all day and doesnt move. my betta as well has stopped eating even though he has been fine the whole week and a half we have had him. is there anything we might be doing wrong? the water is always around 78-80 and the tanks are filtered. we were told that bottled spring water from walmart is good but could that be the reason they are all getting sick?