I was feeding my betta today and noticed one of his eyes looked swollen. Now I am scouring the internets for medications and solutions. First off, what is the best meds that can be found at Petco for the situation? Also I have no idea why he could have gotten an infection. The tanks stats are: recently cycled a couple of weeks ago weekly water changes heated to 76 degrees Aquaclear HOB filter ph: 6.8 0 ppm on Ammonia, Nitrates, Nitrites. I put a watersprite plant into the tank about two weeks ago and bits of it have been dying off from the initial bleach treatment but I have been removing dead material when I can and there are new green bits here and there.