My new lights came in and they all work!!! YEAH!! We added a tang. My kiddo bought it with her bday money! Way cool! All my params are good and we are chugging right along. I was thinking of adding some corals - possibly a bubble or hammer. I've been looking on the sites and they say "moderate" or "strong" lighting. What should I be looking at keeping with the T5 lights? 400+ watts. I've never seen a test for calcium at any of my lfs's....liveaquaria? Should I test this first before adding a coral? And how long between adding fish should I wait before adding another?