I have a 29 gallon tank with 72W of T5 NO lighting. I inject CO2 though a reactor and measure it with a 4dKH drop checker - by midday my plants are usually pearling and the drop checker is lime green. Normally I dose Pfertz 3X weekly at the recommended dosage. All was going very well for over a year. In the past few weeks my LOBELIA CARDINALIS and even staurogyne repens has taken a turn for the worst - they look almost wilted and started taking on a lot of GSA. My inclination is a phosphate deficiency. Any thoughts?
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