you guys are right and i just finish going thru that due to extremely bad advice from my local fish store. I had 3 tangs a maroon clown a manderine and a watchmen gobie in this 50 gallon tank. until things started dieing and i started joining these reef sites and with everyon es hep i got rid of all the tangs cuz it was a rediuclous bio load on my tank, and being new the fish store just kept trying to sell me stuff. but i am past that now and i am on my way to doing it right, i need a light and need advice on what to buy, i am making my sump into a refug this weekend, and i will add about 20 pounds of live rock with a light, and mud, as well as cheao. also i will put 50 more pounds of rock in the tank little by little. then i will let it run for a couple of months until it is stable, then with the advice of the reefer i met from my area will i put things in, as a matter of fact he is holding 5 peices of my corals until my tank get stable, like i said i was buying all kind of stuff and this dumb fish store in nj really screwed me but you live and learn.