It depends on what you want to accomplish. Fresh or frozen small shrimps to increase red coloration. Just make sure you remove the horn. For the kok use chicken or beef heart (chopped into tiny pieces). feed before a water change since this will definitely cloud your water.
IVE BEEN GOING WITH A NEW HIKARI BIO GOLD, WHICH HAS IMPROVED THEIR COLOR BUT HAS NOT STARTED ANY NUCHAL GROWTH. MAYBE ITS NOT IN THE CARDS FOR THEESE FISH. ITS ALL GOOD, GOT SOME NEW ONES COMING SOON!!!!!!!!!!!! THEESE ARE GONNA BE RIDICULOUS.
right.... try to feed your superworm with red enhancing pellets first. You will notice that these worms will turn red too. then feed them to your fh. yum yum