I got a Sea Urchin Partner Shrimp from my LFS, it was just labeled as a Purple Shrimp. They told me that as long as I didn't have anything that ate shrimp and feed him brine shrimp he'll be happy. Dose anyone have experience with them? Should I get a urchin? I have a 5 gallon Fluval spec heavily planted with assorted algaes is there a good urchin for me?