Small Appetite?

[BEETLE]

I've got a pair in a split tank, the female will always eat if offered food, the male will often only eat if the food walks right up to him. Its obvious he is not that interested, but every now and then he eats like mad. I think that once they are grown, both ate everything offered when young, they eat far less and as my male hardly moves he simply does not need that much food.

[Kevin1]

There's no particular brand I prefer, just try and make sure it's a submersible heater.