Hello everyone. I'm currently fishless cycling a new 75-gallon freshwater tank for Rainbows. Did a lot of reading here first. Special thanks to RTR, JSchmidt, Daveedka, Roan Art, and others. Got my bio-only Eheim 2217 (75% Ehfimech + 25% Aqua Chargers) and a HOT Magnum 250 stuffed with floss working with some "live" Bio-Max, gravel, "squeezin's," and an AquaClear sponge filter from an active 20-gallon tank. Plus I threw in some Bio-Spira for good measure. Got the Filter Max III's in the mail today for pre-filtering. The research has been almost as fun as the work so far.