I'm not sure that I would consider a DSB in my 33g sump/refugium adequate for my 90g tank as well. The DSB in the sump is probably adequate for the sump... ;)
Just my opinion. For a more weighty opinion, check out
http://www.rshimek.com/reef/sediment.htm
He has more to say, fer sher.
AJ
[ 16 March 2002, 15:25: Message edited by: AJ_77 ]