Hi MikeP471612,
From what I have read they do not need to be target fed, that said I target feed mine (I also have a red open brain). A lot of people will say that feeding them a small fish is good but unless the brain is very large I'd cut it up into small pieces (less than 1/4inch). It takes more energy to eat a large meal versus a small meal. They really like mysis which I feed mine once a week. Also, they will feed during the day but it is best to feed them when they have their tentacles out, which is mainly at night as they are night feeders. I hope this helps.