Buying reverse osmosis now. The Proper pH 7.0 seemed to clump up and form at the bottom of jar after a day or two. No finrot since. Just recently I encountered velvet for the first time. I believe the use of live bloodworms brought in the infestation.
Live worms are notorious for harvesting bacteria and other parasites.
Upon shining him with a flashlight, I could see he was covered. 5 adults and 4 newly jarred fry. Ick and velvet is easily spread by using same nets, wet hands, etc. I think I sometimes touch the tweezers in their water when feeding worms and go down each row - I was probably spreading this everywhere. Colors fade, fins droop, fold and gradually become torn.