Amquel will only help temporarily if at all. if your fish have ich and there is ammonia change the water to get rid of the ammonia. They are already stressed out enough. you will need some kind of fbacteria cultured filter since you probably have a bare bottom tank. Other wise do lots of water changes. And test for ammonia and nitrite. Also water changes help get rid of ich and velvet by removing the parasite after it ruptures and begins reproducing.