Hi not sure how to ask ? Had a tank setup for dwaf seahorses. Got Hydrozoa to the point of killing some seahorses, setup a small tank moved them.The new tank has new water not cycled. There ok for now. I hear fenbendazole will fix old tank is this the same as the dog dewormer? Can I just keep changing water in new tank to keep nitrates down,while treating other tank? Used dry rock and sponge filter in old tank. I"m going to take snail and anything live out. Any info would be great , never had this problem before, added snails ect. came in on that Thank you