So my ammonia and nitrite are at 0 and so is my nitrate. My nitrate has not been above 0 since I've had my tank cycling. It's been cycling for 4 months now. My corals were doing great and now it seems like they aren't. Probably cause they came from a good tank in the lfs and now they are in a tank with no nitrate. I need some help and nothing seems to be doing fine anymore.