in regards to NOT feeding flake and switching to pellets, pellets are best but they might not take them...ive had a boy for almost a year that ive tried and tried to get to eat pellets and he just wont...occasionally i continue to offer them and he wont touch them...so he gets flake as staple and his treats and peas...some just wont eat them...and hes happy and healthy enough so if you want to continue feeding flake, go right ahead. it is best tho to keep a varied diet of bloodworms, tubifex, daphnia etc (if using freezedried please soak them first until they are soft- leads to less problems like constipation- yes, fish get bloated too) and feed a cooked deshelled chopped up pea once a week or so...helps clean them out and avoid bloat.
wlcome to the forum...lots of good stuff here!
and i love him...im a softy for the red boys!
cheers