I've been communicating with Seachem regarding their brand of Metronidazole. I had first tried the food only approach. Then after a couple of weeks of the food treatment not working I added it to the water. Seachem recommended using the low end of their recommended dosage. I had asked about feeding metron and using kick ich in combination. They said all kick ich is, is metron in a low dose. Anyways added three treatment cycles, before I gave up and moved to hospital tank. The point is my inverts were fine, fire shrimp, soft corals, cleaner shrimp, blue legged crabs, amphlipods. This treatment did not work for me and a higher dose could have caused harm. I was trying to cure a powder blue tang, which may be more difficult than other fish.