"Peter Pan" wrote in message . ..
Are you guys talking about reef tanks ?
I am confused... This recomendation would be
agains the reef tank idea. Maybe fish only tanks ?

Why would it be against a reef tank, when corals
usuually require cleaner water to survive ?

Particulate matter suspended in water is part of FOOD for them!

Cleaner water - yes, in terms of dissolved nitrates or
phosphates, but mechanical filters are competing
with filter feeder animals like corals, feather dusters,
sponges, shellfish like clams/oysters/scallops etc...
In a reef tank major chemical filtration is done in
and on the surface of live rock not in canister
filters - they just accumulate debris and convert it into
nitrates/phosphates - not the way it supposed to work in reef.