I used to feed silversides many years ago, and once in a while I'd see someone post about them being an issue, and of course since I had been feeding my nems silvers for many years, I ignored it and continued.
It would be years later in a nem specific tank where I had 3 established LTA's, and after a feeding of silvers, all 3 immediately released from substrate, shriveled up, and just melted w/in 2 days.
I figure there are just too many other safer options.
Krill is one I see others use, I have not heard of anyone claiming a color enhancement from krill, but possibly I suppose.