I have one male betta in a 10 litre (2 gallon) tank. Lately i had the other small fish in there die, I think it was from overfeeding but all is good now. My worry now is that my male betta is rubbing against the the filter, I have checked for white spots etc for ich but I see none and also it looks as if his rear tail is damaged. Im also worried it may be because the tank is unheated.
Picture of fish up against Filter:
http://s565.photobucket.com/albums/ss98/joev789/?action=view¤t=STP62189.jpg
Picture of fish up against Filter:
http://s565.photobucket.com/albums/ss98/joev789/?action=view¤t=STP62189.jpg