you'll find that MANY people use no filter on a sw tank. if you have adequate amount of LR and/or LS that IS your filter.
and it's been said that it also will yeild lower nitrates than a bio ball or
bio wheel system.
my fowlr was getting close to 40 on the nitrate readings. after removing the
bio balls from my wet dry and making it just a sump, my nitrates now stay below 20
fwiw: i removed 1/3 of my bio balls per week for 3 weeks. jsut to avoid any sudden changes in the biological element of the filtration.
__________________
Proud member of the "J" Crowd
Proud Co-Founder of the SRD's

Proud-Macho Member of the MMR club