For my 75 gallon, I use a HOB and a canister with modifications. I use the canister as a biological filter and HOB as a mechanical. For the canister my intake is covered with a prefilter sponge and it's located as far up as possible. I've found that poop and left over food is picked up the least there. This prevents the sponge in the canister from getting dirty quickly. For the HOB, I added an extension tube to the intake is all the way at the bottom. This allows much of the poop and detris to be picked up by the HOB. I just use cheap poly and replace it twice a week. I also have a circulation pump that runs for a few minutes twice a day to move poop towards the HOB intake to keep the bottom clean. Pump goes on when no one usually is at home. This works great for me.
2 X 2 Hydro V's, double stacked, is all that I run in this 110 gal tank. If you're changing water, expensive filters are really not necessary. All my $$ goes to fish.
Willie
At my age, everything is irritating.
Stanica - You might want to check out the Pondguru on Youtube as well. He did a video on setting up an FX6 properly. Just remember that he sells biohome media. It's good stuff, but expensive. You can use other stuff too.
I could find a sponge pre- filter for my hob filter so I bought a sponge for aquaclear 70 one end of it I cut a circular hole with kitchen knife down deep in to the course spong and placed it over the intake
I use an large ehiem canister and a big sponge filter with a power head in the top of it.
Stu