Do what you can, but at some point, you will need to get your filtration sustainable. It'll need to happen, otherwise, it's just going to become a mess that you can't control.
Rock solid proven way to keep harmful levels of anything is a strong skimmer with at least 2 full cups a week skimmed.
GFO will help with any excess phosphates that breaks down from something your skimmer doesn't catch. GFO gets expensive, and you might be able to get away with a really strong chaeto grow if you have space. You could even put together an inexpensive algae reactor (marine depot has a good cheap solution with an Aquamaxx and accel stirp light).
Basically, skim out stuff before it breaks down. Water changes will help you fight nitrate build up and replenish water parameters. Phosphate solutions to keep algae at bay for, well, visual problems mostly.
Filter floss and bio balls, just going to trap more poop to turn into nitrates and phosphates.
If you want to polish up your water, you can run Carbon.