I would suspect your reactor, poor C02.
58g with 2x96pc, I do not know if 2ml Fleet is or is not enough, I use dry KH2P04, one way to find out is test P04 two or three times a week for a couple of weeks and see if the average is around 1 to 3 ppm if so then good.
For your tank I would dose 1/2Tsp KN03 3x a week is plenty, 10ml CSM 3x a week.
Take a powerhead and inject your C02 into that for a couple/few days, if things improve, which I am sure they will, then you know the reactor is poor.. hince poor C02, I dont care what the numbers on the test kit, or ph chart say, highlight+poor C02=algae Everytime!
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