I think they are neat little guys, very tough looking. But I havn't been able to keep them alive, i have managed to kill two of them. You really need a small sandy substrate and be willing to almost hand feed. They are filter feeders and have horrible eyesite, they love to hide. Make sure you really check them in the store, the ones i always see are sick, or sickly from shops that don't understand how to keep them. The first one i had died within 24 hours, and the second one i let a shop keep convince me to use calcium hermit crab/ reptile substrate, big mistake gave the little guy a horrible guy blockage and he passed away despite my efforts. They are dragon gobbies or violet gobbies