We just started our 46g tank 3 days ago. We have live sand and live rock (from TBSaltwater). We have done the required water changes when the ammonia gets high (can't get the ammonia level lower than .25). Yesterday, we noticed small white spots on the surface of the rocks. When we got up this morning, we noticed that they are growing! HELP! Is this normal? Is it dying? We are new to sw. We would appreciate any help!

