I have 29 gallon aquarium that is currently housing 6 apple snails. It is non-planted and has a Penguin Bio-Wheel 350 for filtration. The pH is 7.5 and the temp is 78 degrees Fahrenheit. I am looking to get a couple of medium size fish that will not harm my snail. I was considering getting either some dwarf gouramis or some German rams. Any thoughts, comments or suggestions are most welcomed.