Filtration
I use all AquaClear (AC) filters, as after a period of initial noisiness the impeller and well become sufficiently coated with biofilm* to run silently and well without reductions in performance, as long as care is taken with them and worn parts are replaced on the rare occasion the need arises. The design is simple, making them easier to repair thanks to fewer moving parts. Extra pipes are easily added so the filter pulls water from the deepest parts of the tank where nitrates can otherwise settle. They are, however, not self-starting, requiring a cup or two of tank water to be poured into the body before plugging them in. I've tried several other filter brands and keep those on hand as spares - with seasoned media stored where it will retain its population of beneficial bacteria - but always end up coming back to the ACs as my filters of choice. I run multiple filters per tank, an AC20 and AC30 on the twenty-gallon long (20G-L), and two AC30s and an AC50 on the fifty-five-...