Hello everyone I'm 24 years old and started a 16 gallon biocube on July 17th. I used 20 pounds of Caribsea life rock, 10 pounds of Caribsea Hawaiian black sand, and premixed Imagitarium pacific ocean water. I used Dr. Tim's one and only along with ammonia to fish-less cycle. Ammonia levels dropped to zero after a week, and now I just have to wait for the nitrites to go down. My plans for this tank include a clownfish and soft coral.