#9 steve123 User Aquariums good news ok guys good news i brought my fishes to a pet shop and there was one guy who explained everything wrong in my fish it was mainly water and it wasnt fin rot it was an agressive guppy so i exchanged that and my ammonia was sky high so he asked me to do a partial water change and he brought me some of his sand in a fish tank which he told he has been with for 4 y