The legs may well have been missing before you bought it. They will grow back though so don't worry about it. Things will settle down once everyone establishes their own territory.
Be aware that the brine shrimp has little to no nutritional value at all unless you fortify it yourself. You would do well to alternate it with other meaty foods or even flakes.
Be aware that the brine shrimp has little to no nutritional value at all unless you fortify it yourself. You would do well to alternate it with other meaty foods or even flakes.