I have a growing Senegal, he is able to take pieces of silversides. I have a twenty gallon breeder tank that I'd like to switch to marbled crayfish, but I want to make sure their shells won't be too rough on a senegal's digestion. I've found 10 marbled crayfish for a reasonable price, and think I want to try my hand. Will feeding a marbled crayfish harm a senegal in any way? I would only be feeding young ones.