Remember this is a new tank, and will be chemically fragile. Get test kits for alkalinity, ph, calcium, nitrate, ammonia, and apply them frequently while using Flatworm Exit. I don't know if all of them are helpful, but they're interrelated, and I have read numerous posts from people who have crashed their tanks---I suspect by not paying strict attention to params while using the stuff. I'd be testing every few hours and logging the results to spot any developing trend.