Fantastic I will give it a go your way thank you for the information It will be going in a cichlid tank at the moment I have black substrate in there it is all coming out so am going to be doing a complete revamp on my tank putting in a mixture of silica and coral sand thats on its way now to find another tank at least 100ltrs or more to house my fish for a couple of days till it is all done will post some pic will not be untilafter new year before I start