Amnesia Haze Auto flower - Runoff extremely acid! Help

Do you have a recommended application rate for 5 gallon containers filled with peat. I am day 55 in flower and pH of runoff on a couple of plants has dropped from 6.5 to under 5.5 over a two week period. Or, is it too late for it to do much good? Let’s Grow Some Purple Kush

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