i gave mine San Francisco Bay Brand Freeze Dried Plankton then slowly moved him over to pellets but never give them feeders its to much fat can cause drop eye
It doesn't matter. If you are feeding frozen, make sure to thaw it out before feeding.
Eating cold food would give your arowana stomach problems.
Personally I'll go with freeze-dried since handling them is much more easier.
Go for Hikari FD bloodworms, they have this nifty cap which you can open and pour some BW into the tank.
i gave mine San Francisco Bay Brand Freeze Dried Plankton then slowly moved him over to pellets but never give them feeders its to much fat can cause drop eye