We are in the process of changing out the cc to sand.. We are doing this partially because we have had a really bad problem with GHA.. We still have a GHA problem but it has slowed down .. All the advise you all have given us has help significantly!! Thank you all!! We are going down a list that reefsparky gave us to follow and on the list was to switch out the cc so that is what we are doing.. Thus far everything is going good!! .. We will be doing another section in about a week and a half.....