K deficiency in a low light tank
Two species of hygro in my low light, RCS tank are showing signs of K deficiency: small holes on lower leaves which are yellowish and dying. The tank has been dosed per EI light for low light tanks:
1/8 tsp KNO3, 1/32 KH2PO4, 1/32 K2SO4, 2x/week + Excel as directed.
1/32 CSM+B or equivalent Flourish 2x week.
No GH Booster - water is 150 ppm GH, 120 ppm KH
I've since lowered the KNO3 to 1/16 KNO3 2x/week and test results indicate sufficient nitrates. The deficiency symptoms were present but less pronounced under the higher dosage, as expected. I have both K2SO4 and an old bottle of Flourish Potassium available.
1. I'd like to use up the liquid K, then switch to additional K2SO4. How much of each should I use?
2. Could this be a phosphate or calcium deficiency instead? I've seen rapid shell disintegration in my high tech tank - whether it's because of the CO2 or a possible Ca deficiency is unclear (although the latter would point to a very high and presumably unlikely Mg-Ca ratio).
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