The problem with feeder isn't just that they could be bad, or lack nutrition. It can also cause them to stop eating other types of food and not eat frozens or prepared.
It isn't the tank size as the Johanna that I spoke of is temperarily housed in a 55 right now and has been there for a month waiting to ship to someone interested purchasing it and he started eating. Garlic is said to help entice them to eat working to stimulate appetite. Personally I never had any luck with it.
I think he is just being finicky right now, He will get hungry enough. I never had a pike not eat after starving a period of time with the exception of my Trombeta. And
she was starved to try and get her off of feeders for 21 days. It did not work for her, so after 21 days I went back to feeding quarantined and gut loaded feeders.
MAY SHE REST IN PEACE, STUBBORN SOB.