I have a 75 gallon marine land HOB filter in my 30 gallon. I recently removed some of the sponges to put in a different tank. I thought that the bio wheel would be able to handle the bio load until the new sponges got cycled, but my fish have since started acting strange. I don´t have my test kit on me right now and will test it once I get it. I have done a 50% water change yesterday and am worried about the fate of my tank. Am I just doing something wrong with the bio wheel or does it just not work?