I'm going to have to remove everything from my tank , and replace the old sand bed , with new sand . A while back I let my PH get too low ,and most of the sand bed fused together . It is so hard I can't get it to break up . I have my calcium , Alk. , and Mag. all back in line now . When I put everything back in the tank , I want to have all the rock supported up off the sand , and arranged so I can stir the sand everyday . The sand will only be about 2" deep . I don't like deep sand beds . It is going to be a big job , so I will need to get everything ready , and set up before I start .