Hello i have a 55g tank started with about 60-70 pounds dead base rock that was once alive so there is some dead stuff in it. i also have about 2-3" of dead sand. I used about 20 pounds live base rock to seed the dead base rock and a couple of cups of live sand to seed the sand. Well i was told by my uncle not to run my skimmer during the cycleing because the skimmer takes out some stuff the tank needs to cycle with. SO this brings me to the question should i run my skimmer? THe tank is about 2-3 weeks into the cycle and ammonia is going down a little. thanks