As others have pointed out, stop adding so much food. No liquids, rinse the frozen that you reign back to twice a week, supplement with pellets of flakes, but sparingly.
I'd use some sort of nitrate/phosphate removal media, choice is yours on what works best.
I'd also up the volume of weekly water changes to 35% or so. Adding a couple of turbo snails may help with that red stuff. When doing your water change, try to scrape the crap off the glass as you siphon it out. This will be the quickest export method for the nutrients.
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Brad
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