This rule is generally useless as length doesn't determine body mass and waste of fish. It also doesn't take into account experience level or filtration and water change routine. You could get away with adding Kuhli loaches but make sure you do about a 50% water change a week or split that amount up. I would also recommend picking up a filter like an Aquaclear 20 and placing the pouch from your current filter in it to cycle the filter. As those Top Fin filters aren't that great as they are mostly just carbon in a little foam pouch. But you'll get away with it just Aquaclear will give you more surface are for bacteria and a bit better flow rate for your stockingThe general rule of thumb is 1" of fish per US gallon of water.

I would presume so I've ran aquaclear 50's on 10 gallons with plastic hoods in the past.Yes everything is going to be mature, will that aquaclear 20 fit in my tank slot for the powerfilter.
This rule is generally useless as length doesn't determine body mass and waste of fish. It also doesn't take into account experience level or filtration and water change routine.
This rule is generally useless as length doesn't determine body mass and waste of fish. It also doesn't take into account experience level or filtration and water change routine.
As I said, it's a general rule of thumb. Funny you're quick to be critical yet you too state it is "generally" useless. The rule has merit and of course there are other parameters and routines that affect the overall health of fish in a tank.
