I would probably be using an AC 50, and the tank, as I am doing in my 20 long, will be dedicated to the health of the fish over the plants (i.e. larger WC and higher filtration than high-tech set-ups).
I thought I read a few months ago java moss and java fern were ok in brackish, along with marimo balls, but I don't quite remember.
What would really be helpful would be a little list of plants that anyone on here has successfully raised in a brackish environment.
This is just an idea at the moment, and I won't be doing it until my F8 and his tankmates inherit the 35ish gallon tank, which will probably have sand b/c of my freshwater sole.
Let me know what you think or if my question is to broad, I'm typing this on my way out the door!