just make a little insert that goes on top of your existing 1/4" out of 1/8"...

They will get it.

yes mine seem to be attracted to hog feed more than 6f also.

BUT....my experience with various feeds...(sand valley and zeigler) resulted in the same as your with solely hog feed.

6f has produced so well for me, i won't dream of walking completely away from it.

My rats also get any table scraps that are edible...not much goes to waste here anymore...

if the rats won't eat it..then the meal worms will...