I am looking for a calcium and alkaline supplement and test kit recommendation. Also, is a magnesium supplement important? I have zoos, xenias & shrooms in my tank. I am trying to get to the basic supplements I should be adding to my tank. I originally purchased supplements which may not be necessary (PH buffer, calcium supplement powder, trace elements supplement, etcââ"šÂ¬Ã‚¦). It seems like every time I go to the lfs, they are trying to sell me a new supplement. Thanks.