I thoroughly researched both the FX4 and FX6, when I set up my 120 long. Petsmart was having a sale on both at the time. I inspected the FX6 and noticed that it is roughly the same size as the sand filters sold with kids 500 gal
. Swimming pools. The FX4 though smaller, was still huge.
The only canister filter I ever used was the old Marineland 330, on a 58 gal
. Oceanic tank. It was more than enough filtration. The FX6 looked at least 3x the size of the old 330. I'm certain that the FX4 along with regular weekly WC
would be enough filtration for a 150 - 180 tank. The FX6 might be a little over kill, IMO
My old M330, was very inconvenient to clean, and I was in constant worry of a leak. Both the FX models look to be big improvements over mine, but still are likely a PIA to clean.
I went with 2 AC
110's. Simply for the ease and convenience of maintenence. My guess is an FX6 would be like having 4 AC