So i would realy like to get some shrimp for my 20gallon molly tank? Ive never kept them before. I want them to help clean the tank along with my malaysian trumpet snails. They will have to be brackish water shrimps and id like it if they were quite hardy. I was having a look at ghost shrimp but i dont think they would stand out in my tank as i have a white sand substrate. Also i want them to be peaceful and a species my mollys wont bother or visa versa? will shrimp eat my snails?