I came down yesterday only to find that every single one of my emerald crabs legs had called off! It's defianatley not and empty shell after molting because I can see it's little mouth flicky things moving and he is dragging himself around the tank! I feel quite sorry for him, and all my water parameters are perfect. Water absolutely fine, no nitrates,ammonia, phosphates nothing. Calcium levels fine as are kh
and ph. At the same time my sand sifting starfish has also died and gradually been eaten. Don't know what's wrong!!!!! All I have are some turbos, red legs, commn clown, and a royal gramma. None of my tank mates have ever been aggressive towards each other so I really don't know what's wrong! Tank is 20g/90litres (approx) nano. Please help! I will shut up now.