wow, nice snail, um i have one brown one that came fromyou with your plants, and it's in my 55 gal right now, and i kills the other black/brown little one, they eat my plants and over crown my tank
hey mg, i will look up a chart for you. there is a trait guide on this link that can help you figure out the probability of your prospective colors. http://engr.smu.edu/~dquick/
This chart is compiled by Donya at applesnail.net
really nice looking snails by the way!