depends on what type of fins you have. plakads/plakats dont have very long fins, this is a possiblity for your fish. your fish also may have finrot which eats away at the fins. may we see your fish possibly?
i've alerady had 2 bettas...one died....and the other one is currently..."sick" i clean the tank..feed it regularly...but would a variety of food be good cuz i've only tried bio-gold pellets? and plants? i've used rocks i dont know what benifit it does for them but any suggestions would help
well a varieyt of food is alwsy good. Frozen bloodworms is a great addition to any betta's diet i feed my pellets, frozen bloodworms, frozen brine shrimp, and peas