Is there any material detailing the differences between the shrimp variations? Or is it not worth it? I'm just wondering the benefits of each breed of shrimp and how it effects the tank. I just got four ghost today and I'm looking into more aesthetically pleasing varieties but i'd rather know the differences between them. I know so far that ghost shrimp don't eat algae which is fine because I don't have any, but I've also read that they don't eat enough at all to really clean much. So i'm wondering what the perks of each variety is other than price.