i feed my big aro full shrimp, silversides, beefheart (ocasionally), hikari floating sticks and pellets, i tried fresh squid once but he didnt like it, he will not touch a feeder but will eat any dead fish there is. Right now he is about 2" thick from the top and 2' or so long I am not sure hard to measure him when he has so much room to get away. sometimes i throw in live crickets but he could eat 3 dozen at once he is a pig. I have thought about trying frozen pinkies (baby mice) but havent gotten to it yet.