Beautiful shrimp! sometimes even act as cleaners. VERY shy, tho!!!!!!!!!! If u have a real big tank, u may never EVER see it. a tiny reef cube is perfect for them, cause you're much more likely to see them. If u feed the tank, tho-brine shrimp, coral food(particles, not just the liquid), etc. they will come out during feeding. I would give them 5*, but because of the hiding, I hafta give them 4, instead