The planting looks pretty sparse in the pics, but that water sprite will take over the tank in a couple of weeks! I have all the sprite floating right now, should I plant some near the middle of the tank to make more of a "barrier"?
I put all of my girls in the tank at the same time. I have a ten gallon with four (was five - one was a boy) girls in it. I kept the light off for two days when I put 'em all in. Turned it on and all was well.
I vote cabomba for a fast-growing, easily spread, easy to cultivate plant. It takes over my tank in days, literally days.