Energy, you need to make a post on this MFK, I have been following your thread on the other MFK (Minnesota Fish Keepers) site! Your tank is probably my favorite monster tank out there, as it really imitates the bank of a river! How many gallons do you think you have in there with this set up? Probably about 400 gallons in the water section. Total tank volume is about 1700 gallons.
Todd, im sure some vegetable would work! Id look into the vegetables they grow hydroponically, as it is the same idea! I think some herbs would work well.