there has to be a brackish snail..
plecos are really cute when small but when they get about 5 inches they will have a poop hanging out of there butt, every time you look at your tank...
Its not fun cleaning it all out either. If you buy aquarium salt and go by the general tonic and stress reducer instructions, thats not brackish, but a pleco will survive .
just try to find a brackish snail.....