ok, instead of making another topic i will ask here. how much calcium should be in a tank with out stony corals? And if I add stony corals to the tank will it bring down the amount of calcium. I have lights from my 20g tank that I was making rimless but it broke so I made one of my 10g rimless and it's sitting dry on my dresser right now but I might put my clowns in it because they are being mean to my other fish. ( the clowns in my 55g tank.)