Ok. Thanks for the info. I'll look for the thread.

And why should I remove the Crushed coral bed? It is Aragonite with some shells in it. And it is going to be a reef tank. I am going to add some sand to the bed. I used the coral to take up more space. I didnt want to have to buy 300lbs of sand. This way I can get about 80 lbs and add it. I will also have 80lbs of live sand from my 58 that is going into my fuge.