Tiger is a doubletail in a 5 gallon tank with fake plants, a filter and a heater at 78 degrees. The tank is not cycled, mostly because I'm not sure what that means. I've had him in this tank for months, and have not added any new plants since that time, or had any problems with him. Now suddenly, he has rips in his back fins and huge bitemarks are also visible. He's never bitten his tail before, and I'm at a loss as to why he ripped his fins now. I'm planning to get new decor that will hopefully help with the ripping, but I've never had a tailbiter before. Other than AS, what else can I do?