Hi Glenn, welcome to the "emersed thing" world. I'm a newbie in this world to, but the only thing I can suggest you is, try to use the search tool of the forum first, there is a lot of information here. Searching for "blackwater", I found this link (there are many), that maybe could help you:
http://www.aquaticplantcentral.com/f...germany-2.html
And about the 2 or more different need for the plant, you should have different setups for different species, or for instance, have a setup for "neutral" PH water crypts, and put the blackwater ones in closed pots (without communication with the setup).
I hope this can help you a little bit and wait for the expert's aswers

Regards. Fernando