Hogchokers are fish that give classifiers fits, they will happily live in everything from full salt to totally fresh, I have read that even the freshwater ones will move to somewhat brackish to breed but if you are not breeding it then who cares? They get about 8" long. They do prefer temps a bit lower than most tropicals and the wild cught ones tend to have flukes, they show uo as dark spots near the base of the fines if you backlight them. Just use a antiparasite medicated food like the one made by jungle during your 10-14 day quarantine, They will eat small fish.
There are more flounders and soles that will live but not breed in fresh water. you just need to ID your fish to check it out.
Even some of the tongue soles will live in fw (most of the Cynoglossus sp.) and some will breed there like the two from Borneo/Sumatra, the C. kapuansis (11") and the C. waandersii (4"). I have never seen them for sale but they are not rare fish.
The C. arel and C. bilineatus do show up in stores sometimes and they get a bit more than 16" but can't be bred except in salt water.