My betta is a half-moon betta and lately I've been noticing his tail was dissapearing in "chunks". I did some research and assumed he was biting himself. I treated him with some medication to fight off infections and change his water at least once a week. I just want some suggestions on how to get him to stop biting and how to repair his tail. Details: Tank size- 2.5 gal. Decor- 1 marimo moss and malasiya red aquatic plant (no gravel) Meds- Betta-fix by API Filter- Whisper In-take Filter 3i If you need any more details about the tank or my betta please ask!