Ive had my salt water tank set up for about 2 months now, i have about 5 kgs of live rock and a very small peice of coral, ive been getting my water checked by the lfs and has been good. 2 days ago my amonia was low, and now today it was high, is there anything i can do to lower it? i was told to do a water change, i did a small one and now my 2 clown fish have been acting weird (swimming odd, going up and down the tank, swimming very fast for a few seconds) im really worried >.>