I'm glad you got it sorted out. If I were you, I'd stick with the tea. As you know, it has many benefits over simply guarding against slime and rot: greater nutrient uptake and the ability to allow for slightly higher water temps (if your keeping the water DO high enough). I ran rdwc for the first few years, and Heis' tea saved my life back then. I do F&D now, so I run sterile with Zone with no problems. Good luck!