So - for now - I have started carrying Inocucor Garden Solution again. (If they can’t get it to me intact, without spillage, I won’t bother.)
The company that now markets it, AlgaEnergy, is a big producer of microalgae nutrients. They sent me a sample of their Surety MA product, a microalgae-sourced fertilizer. It’s a 1.5-0.2-0.5 formula, with half the nitrogen being nitrate and half urea. I’m not certain what I’ll do with it at this point.