Just wanted to give an update on my expiemece w the Levi. So I followed islanders dosing ratios and did 5 g for 300 gal for my 90'gallom reef tank w soft corals and zoos and a few fish. Took my sea stars and cucumbers out and pu an air stone In a bowl for them. Took the carbon and reactors offline for 2 hrs and then did 10% water change. So my biggest fear was of course that everything would die. And so far 4 days later everything has rebounded beautifully. The corals are looking great and the fish seem fine. Like islander said, the shrimp definitely get stunned but are fine the next day. Now unfortunalty, all the fish that really had ich had already died before I was able to do the treatment. So now it's more of a preve titive measure for the new fish I'm going to add. I am however going to do another treatment in a week to really eradicate any eggs that survived the first one. One thing I did want to know from islander or anyone out there, do u recommend using Levi for a dip when adding new fish? What ratio should I use and how long? Thanks again for this info