ULM cycling, a few days after the tank has been filled, add a large frozen shrimp in a media bag. Give the shrimp a few days to decay and remove. Give the bacteria a few days to run. Then begin adding Dr. Tim's. I usually have clean cycled bio spheres I can add. After a few weeks test ammonia. If ammonia is good, test nitrites and so on. Once water is good, slowly add fish. I've cycled my 75, a 60, my 15, and a 150 like this. My freshwater cycling is almost the same. Only thing I've changed over the years is the bacteria additive. They all seem to work.