We have an 100 gallon reef tank that has occasional bouts of bubble algae; along with remedying the contributing factors, we use emerald crabs to help eliminate it from the tank - they're a wonderful little army of algae eaters! We nearly always order them online as our LFS and not so LFS don't consistently have them in stock. We ordered from Saltwaterfish and I was so pleased with the little guys; they arrived active and alive, were packaged well and I was THRILLED to find a healthy mix of sizes in the crew. Other online fish stores send out the itty-bittiest crabs, NOT so here - I was pleasantly surprised to find quite a few big and medium guys in the mix. I would definitely recommend and will definitely be back to refresh our little army the next time we're in need.