Best to mix up diet with varied food. I feed frozen or pellet one day live next day. Its honestly up to you with the live feeding. Personally I feed mine dwarf frogs, worms, your size delhezi I would use small red wiglers. ( WHAT YOU DO IS BURY THE WORM UNDER SAND OR GRAVEL AND WATCH THEM DIG IT UP), bait shop minnows (I personally know the guys minnows are good). I feed my small del and albino Molly fry and small enough to be eaten. (friends tank) Mealworms (if they don't sink take off the head). Crickets, and lastly live jumbo bloodworms. I personally like watching mine hunt instead of being lazy sometimes