Cudas will get along with most non aggressive fish. Atleast anything that won't fit in their mouths. Not sure about a pickerel though but o believe to be more aggressive. Would suggest to get a bigger tank for both fish as they will dart when startled and get injuries.im trying to decide on a red tail/ yellow tail barracuda or a Pickerel ive always wanted a cuda and never seen or heard of the Pickerel till recent. They or it is goiing to start off in a 40 breeder. What breed is easier to keep alive as far as them not harming themselves? Do Cuda's get along with tank mates more than Pickerel? Thanks.