gunman41mag
Shooter
I have two power heads flowing water to my under gravel filter, and a AQUA CLEAR 300 & a Second Nature 3 filterWell, you do, but 5 gallons a week in a 55g tank is going to leave you sitting pretty almost always, unless you have an overpopulated tank.
The inch per gallon isn't all that great of a guideline. It works for some species, but not even close to all.
Small, skinny fish can work under this rule, but I chuckle at the thought of having an inch of Oscar per gallon of water in a 55g tank. 1 Oscar in a 55g can be too much.
Also, don't forget that your tank doesn't have anywhere near 55g of water in it. Mine probably have closer to 35 gallons than 55 with all of the rocks and sand.