It is generally considered bad practice to feed fish still-frozen foods, though more because it may cause stomach upsets than kill them. Bloodworms are a good food for the Cichla, but it is worth defrosting in tank water.
Had the worms defrosted previously and been refrozen? Maybe they were 'off' and he got the fish equivalent of food poisoning. There are myriad possible reasons at this point.
'Bear
Had the worms defrosted previously and been refrozen? Maybe they were 'off' and he got the fish equivalent of food poisoning. There are myriad possible reasons at this point.
'Bear