When I started my 2nd reef tank it was a 55g, live sand, bout 80 lbs 2", 75lbs self cured live rock, protein skimmer, magnum canister rated at 150g, I never really saw a bloom or noticeable ammonia levels I had coralline growing in a couple weeks. I had no fish though I just used the live rock to cycle the tank, and I added a clc in the first 2 or 3 days.