Originally Posted by 5280_humu
Nigertrigg: You might want to thin out the sand bed . Your running the risk of nitrate build up . and If that does happen you could loose your fish. it will acumulate untill it becomes a pocket of posion gas and is released causing your water to instantly become toxic and your fish will die with in seconds.
Well, unless he is maintaining it as a Deep Sand Bed. In that case 4 inches is fine.