most Aquarists with longterm healthy fish feed multiple times per day, just not a lot at each feeding. Feed enough where in 5 minutes, all food is all gone.
Certain frozen foods are perfect to be used like this, PE & Hikari Mysis Shrimp with a few drops of Selcon does wonders.
It's very important to have multiple nutrient export systems to remove nitrates and phosphates. Some will only remove one or the other(GFO, activated Carbon), and some remove both(Carbon dosing, skimming) but at different degrees......
Chemi-clean is a great fix for cyno by the way as long as you follow the directions "to the T", it clears it up in 48 hours......