Blood Shrimp are simply gorgeous. Often, they are fairly expensive at the LFS (local fish store). I've had one for almost a year, and occasionally see it in my 280g reef. It hides all the time, and late at night I can see it briefly if I feed something nearby. I wouldn't recommend this for any tank, but rather for one where you can enjoy this creature if hiding spaces are limited. If the tank contains anything that will make the shrimp fearful, you'll rarely see it. Reef-safe.