I recently set up a frag / overflow tank to put frags or corals that I wanted to take out of my main display. It is a 20G H with a new HO T5 light. I took some base rock and mixed in some LR from my display and let it "cure" in a tub with light, heater, and pump for 3 weeks. The water used was water that I took out of my display during a water change. I used about 60% of the water from my display for the 20G and then added 40% newly mixed SW. I used new sand (Black). Do you think that I will have a cycle in the new tank? All parameters are fine so far. I put a couple of zoanthid frags in and they seem fine. Thanks.