My tank has been up and running for 3weeks now. I have 100 lbs of live sand. The first week I didn't have the water running so no heat on the sand. Did that kill the good stuff in the sand? I added 2 green chromis about 1.5 weeks ago to cycle. Nothing has changed water wise until today. I just tested the ammonia and its at 0.25ppm does this mean the cycle has started? I'm starting to get brown stuff on the sand in some places I'm thinking its some form of algae. I'm running a protein skimmer, BRS duel reactor and my led lights. Should I continue on with the way I'm doing things? I'm going to the LFS this weekend to get a piece of LR. Any reccomindations would be appreciated!