Originally Posted by
madtaz
http:///forum/post/3005941
I bought my tank used. It had crushed coral instead of sand. I would like to replace the coral and add sand or could I just put sand over the coral also do I have to drain the tank or could I get away with leaving every thing in the tank. Thank you for your answers
There is a effective way to place the sand over the CC without having it mix, that looks fine and improves nutrient breakdown, if you're interested in doing a DSB. If you're not interested in a DSB, than take the CC out and replace with sand - chances are that you're going to experience a resurge of algae blooms when doing so, as you'll lose the decomposing microfauna when you pull the CC. Having good quality, real live sand to replace the CC with would help. If you are moving soon, changes are good you're going to experience a mini cycle when you do, so changing the substrate at that point is probably the best bet.