[AaronT]

I've done the substrate swap from Profile to Flourite in a 10 gallon. What I did was to siphon most of the water into a rubbermaid container. Then I took all the plants out and floated them in the water. Then I caught all the fish and stuck them in there as well. Then I tore down the tank, cleaned it out, added the new gravel, and filled the tank part way with water. Replanted it and filled it up the rest of the way with the old tank water and acclimated the fishies to there new home.

I honestly didn't test for cycling, but I never had any problems w/ bacteria or green water blooms.