Just wanted to ask a question. One of my wife`s FW tank has a couple of fish with cottony tufts on them. My SW experience tells me that it is possibly a fungal infection. I`m getting ready to do a 25% PWC and I think I`ll go down and get some pimafix. Am I doing right or is there something else I should do. I know pimafix is for fungal problems. Any other suggestions?