Using jumbo pukani from BRS, bleached the rock for a week added bio spira. ammonia settled down in a matter of days. I used my blood orange clown from my bio cube. He's been my first fish for 2 years since I got back into the hobby and he handled the change very well after one day. I currently don't have a skimmer never used one in my bio cube 29 but I was thinking about getting a skimz on Black Friday