Hi everyone, I noticed today 7 out 9 of my corys are starting to have a little white fuzz on their fins, mainly dorsal but I think I can see some light fuzz on side fins on the pandas. There doesnt appear to be spots, injuries or fuzz anywhere else on the body - the corys still seem happy and active, are eating, digging in the sand, etc. The fuzz is pretty minimal and light at this point, I'm glad I spotted it early. It's a bit hard to see in this pic, but if you look at the top of the dorsal fin, you should see a little white. My 15 G tank has been setup for over 2 months, it is planted, has a piece of bogwood, and also houses 4 small mollies (which I intend to give away to a friend, as I realize the tank is slightly over crowded) and gets 20-30% water changes twice a week. Temperature stays around 72-75 depending on the day and water parameters appear normal: 0 ammonia, 0 nitrite and 5-10 nitrate. I did notice my PH is unusually high, it is normally around 7 and now seems to be closer to 8! Our water comes from a well, so I do not need to treat it for chlorine or chloramine but i do sometimes add a little dose of Prime for ammonia and slime coat. I have done a little research and think it is probably fungus but I wanted to be sure before starting treatment. Do you think it is fungus, and if so, what would you recommend to treat the corys? I do have a hospital tank, however it is only 5G and likely way too small to host all of the corys while being treated. Could I treat the main tank? If so, should I take out the plants? Anything else to take into consideration? Also any idea what could be affecting the PH so much? Thanks so much for your time, I'll greatly appreciate any insights / recommendations you can provide. Hoping I can get my little corys back to good health very soon.