I bought my betta from petsmart 2 weeks ago. Its a 10 gallon tank. I noticed the first day I bought him one of his fins had a white tip (and he had a small white patch under his mouth-if this helps). The rest of the fins looked red like the rest of his body color. Now today I noticed that all of the fins tips have turned white. Its not a fuzzy white. I tried looking up what it was, but couldnt find an answer. The water is clean. and I have done weekly 25% changes. Why could they be white now. Does he have a disease or is this normal?