Seriously, forget about bloodworms because your CK will out grow a bloodworm diet in no time. Get him to eat Hikari Sinking Carnivore then when he gets bigger, switch him over to Massivore Delight. It did take me about 2-3 weeks to get him to eat pellets, but when your CK gets hungry enough, he'll eat. My CK is a pig now and his growth rate is off the charts. Just mt 2 cents. Hope it helped.