you shuld cut out the brine shrimp alltogeather, they have no nutritional value and are like raising a child on twinkies, continued feeding of brine shrimp WILL shorten the lifespan of your cuttles.I have a couple of baby cuttle fish I got 2 months ago. I am feeding them a combination of live and frozen mysis, live brine shrimp, and amphipods. From the reading I've done additional foods are small hermit crabs(which I have on order) and marine feeder shrimp. Mine are about an inch long, and most of the shore shrimp would be too big.
thier is someone posting on tonmo who has been feeding his cuttles brine shrimp and babbie guppies between mysis orders and they are now dyeing off at 5 months old