the clown will only eat hatched fully grown brine shrimp some flakes that float past him in his pot.the bgk will eat the same brine shrimp ,shrimp pellts flakes,krill but his favorite is the hakari brine shrimp.the bgk is 5" and ck is 6".do they grow quick?what should i try feeding them different.am i doing good for my first knifes.i read they are nocturnal.i have blue moon light rope light so i can see the bgk and ck in action swimming around the tank with the lights off.my ck are those nard on his mout.he looks sweet.he has very nice fins and dots.the bgk is very nice in black-blue color.are bgk blind?when do they get more active?