Got a WAL-MART special 29 Gallon setup and enjoy it. I bought the larger 40-60 Aqua Tech HOB
(to give the original, 20-40, to my daughter for her 20gal and we could buy just one type of cartridge for both) and realized later it was a poor design.
added a sponge type filter to the inlet and put a sponge downstream of the only cartridge inside the HOB
Do you think this will be good enough filtration, enough bio material to make it worthwhile
? After a month, and a bio-spira cycle, everything remains in spec and going good....