i wonder what the amount of copper is that shrimp can handle. if i remember right, doesnt csm+b have .1% copperI agree totally with the above poster. I don't know if it's the N or the small amount of Cu, but when I initially dosed per EI I lost Cherry and Amanos. I dose half of N and trace ferts and I have no deaths and wonderful plant health. *Note at the time my plant load was moderate,not really heavy, so the consumption of N and trace ferts wasn't that great I'd imagine.