My 24g AIO cube is coming along nicely. I'm considering adding a couple of sps to the top rock in the back. I'm thinking a green slimer and a birds nest. Right now I'm dosing 5ml alkalinity daily to maintain a drop of 1DKh. Calcium and mag are holding steady with weekly 5 gallon water changes. I imagine that will change with the additional sps. Any thoughts regarding placement or other things I should consider?