Yup, I find mixing food gets them to try each one multiple times until they say "you know what, this is good!" Everyone else takes care of the rest. Powder brown of yours should be sampling all the food too.Going through similar situation with my Cbb and powder brown but I just give them what they eat as the tank is new to fish and I don’t want to shoot ammonia through the roof
I’m also slowly doing a hypo so I remove 5 gallons of salt water and add five fresh daily.
Presently at 2.017 and dropping.