I know u are more of an expert at poly's then me but I think this is to shallow for poly's. Have u ever seen a poly jump out off a tank? I have seen a 16inch poly boost himself off of the floor of a 240 gallon tank straight out and into a drainage sink. Maybe a once in a million poly this would happen but I always have this in the back of my mind everytime i see my ornate make a comotion in my tank and he is going on 12inch. I see my ornate do the same tail boosting off of the side of the tank when he is pissed at my flowerhorn