Thanks guys. The red marble, from the first time I saw one, was my favorite. Also known as calico. So when I saw them for sale on another forum, I grabbed some! And I wasn't disappointed. They're all over my tank now that the lights are out the the blue LEDs are on. They haven't found the green beans yet, but they've found a few pieces of the nori seaweed, and are also working on the back glass of my tank, which has quite a bit of algae. (I only clean the front and sides, so that was another good reason to get plecos). They are so entertaining already, and I've only had them for 8 hours! Definitely worth it, if you have room.