I would go brakish. Get scats, monos, silver shark catfish, maybe an archer. you would have to limit the number of fish to 5-10 total, becuase they all get rather large. none of these should be kept in pairs. either trios or more, or one. Losts of driftwood looks good, and plants,too. however, monos and scats devour plants, and the brakish water isnt good for most plants. My suggestion, use a mix or gravel/
cc for substrate (pH 7.5-8.00. add some driftwood and plants (java fern/moss, vals, onion plant, amazon sword,etc) before the fish. use marine salt for a salinity of 1.003-1.010. These are big fish so i would use a big canister filter. i used powerheads and
hob filter with it, too. Remember that these fish need some vegatable matter, through sprulina food or vegatables like zuchinni or others. the archer can be fed meaty foods, but i like to make them spit for circkets.
HTH!!