You can feed them trout except it should be done sparingly as they are oily and tend to pollute your water more. These oils are beneficial to your fish but not if they end up decaying in your water.
Infact my piranhad get more oily fish(mackeral, smelt,salmon) than white fleshed fish(tilapia, basa catfish) but thats only because i do large 75-90% water changes weekly if i was doing any less i wouldn't feed them oily fish more than once a week.
@ Mfgl trout is not a minnow BTW trout are members of the salmonidae family minnows are cyprinoids.
Infact my piranhad get more oily fish(mackeral, smelt,salmon) than white fleshed fish(tilapia, basa catfish) but thats only because i do large 75-90% water changes weekly if i was doing any less i wouldn't feed them oily fish more than once a week.
@ Mfgl trout is not a minnow BTW trout are members of the salmonidae family minnows are cyprinoids.