i've found dosing PO4, K+, iron, and traces like mad (some even more than recommended in "estimative index", especially the iron, and cutting my nitrate dosing back to about 1/2 the recommended does has worked wonders. Red plants look GORGEOUS, and in fact, they're growing faster, too (i always thought more nitrate = more growth), but apparently PO4 has as much to do with growth as nitrate... Anyway, try cutting your nitrate dosing to about 1/2 of what you're dosing now... wait it out, it takes a couple weeks to see a real difference. Oh, and heed the algae warnings above... if your nitrate drops too low, you'll get algae out the ears. if it starts to show up, you need more nitrate... it's a balancing act that each person really has to find for themselves depending on their plant load, fish load, local water supply, etc. but this should get you pretty close.
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