10-11-2006, 08:09 PM
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I also have a 20gal setup for my kids that has 20lbs or more of live sand, 15-20 lbs of live rock, and 2 hang on the back filters. It as 2 oscalleris clowns, i purple tail fire fish and a damsel. When I first started this tank it took about 6-8 weeks before I even got a reading on anything. Believe me if you have fish in your tank, its cycling. Give it a few more weeks the ammonia should start to show up, then the nitrite, then the nitrate, and eventually your tank will cycle.