well i opened the wallet and went for the black sand from the lfs, i have a even covering now , 25 kg's did it ,, i may add some more if it wears thin in places due to circulation ,,
i will try some pics later when it de clouds ,, i need to upgrade my lighting now though , probly need 4 or 5 tubes and reflectors , or may be cheaper to buy some better ones after i have paid for tubes, holders and reflectors