are you having problems from it? if not leave it in, if you are having problems that you think is being caused by the crushed coral then take it out.

as for the artilce just do a search on dsb problems on RC and you will get more than ennuf info.. there are also some very good discussions going on on the seattle board "reef fronteirs".

Steve

I have 1 to 2in. of sand in my two large tanks and i am quite happy with it. I don't vacuum it or anything it seems to get cyano in cycles. For months it will be clean and white and then cyano creeps in and it is slimy for a few weeks. I just cut down on feeding for a while and its gone in a couple of weeks.

What would be best for in a 10gal Refugium? I was going to use a DSB for this only as my main is 2" CC. I have found that my tank is doing much better if I vacuum twice a month. The stuff that I vac out looked like coffee and smells terrible. No when I vac its no where near as bad. Now all I need is a good skimmer and I'm set. Any one have a Beckett style skimmer for sale that is good for a 90?