Please help to identify my plant deficiency. They are in 1.5wpg of T5HO light that's on for about 8.5 hours a day, no co2 but dosing metricide and EI (1/3). Most of the effected leaves turn yellow, have holes then turn transparent and fall off quickly. This happens on older leaves but they're not really that old, most effected are the hygrophila siamensis they have only the top new leaves left.. I thought it could be the sand substrate but I tried floating the plants for a while and they still die off. I also have root tabs in the sand.
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