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I do EI in all my tanks 15g and up. Anything below that I've gone back to PMDD as it's hard keep a tank that small stable even without microscopic measurements.

I used PMDD for a long time and the switch to EI was dramatic. I had some crypts that were always curled... which apparently was due to a nutrient deficiency. And I can grow baby tears for the first time ever!

Regardless of which you go with, be sure to find out your water hardness and boost it to at least 4. General Hardness contains Calcium and Magnesium which are as important to plant growth as the things we add with fertilizer.
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