Have lost 2 turbo snails (Died for no reason) Replaced with 2 others but both seem to have stopped feeding / moving around. Single Clown ok, 2 Blue legged Hermits ok, Part water change carried out. (60 litre nano, Jebo skimmer with carbon in body) & 7 ltr of live rock. Green star polyp colony. Feeding frozen brine shrimp sparingly daily plus 1 drop of filter feeder food every other day.
No "toxins" detected, though skimmer does not produce more than tea coloured skimmate.
Any ideas?