Big question. For the moment, the goal is to get all of the plants thriving and manage algae effectively. Ultimately, I want the one heavily planted tank to be an impressive little garden like I see in the books.
I feel like I'm getting there, but slowly. Many of the plants are growing like weeds, the aquascaping is starting to look less random, and I have defeated all the algae except some cyano. I'm trying to bring the macronutrients up (NO3 still not up to 5, PO4 still below 1), and have added a CO2 tank to keep levels more constant.
Life is simpler in the Tanganyikan tank, with low light, anubias and java fern. Looks pretty, and requires no extra work or thought.