Having moved all of my fish to a 55 gallon my gf wanted new fish in the 20 gallon i keep at school with us. she went out and bought a gsp and not being sure how to take care of him i have turned to you guys. what kind of substrate is ideal? i've read you need to get them something to chomp on to keep their teeth in check. will they munch on gravel or should i do as i read and go get a few clams for it? any and all help is appreciated. Oh BTW i have the aquarium salt in my tank but have read that it will not help out with the salinity and i should use instant ocean? any further info on that would be appreciated as well.