I've had my 55 gallon with 45 lbs of live rock with a marineland magnum 350 with bio wheel set up for a little over a week. I tested the water today and my nitrite and ammonia are at 0. It's been at 0 for a while and am wondering if I can add a damsel or two. Is it still to early? Has the spike just not happened yet? The water seems to be real stable.