If they are huddled they may need supplemental heat especially if they are sick. I hope they make it as well I know how it feels to have special birds and not know how to save them. I have my own babies I wouldn't want to lose.
Its worth a try. Boiled eggs are good for added protein and if they aren't drinking I would make them. Add alittle water to their crumbles to make a mash ans that will give them more water intake. Chicks usually enjoy the mash more than the dry food.
They could need deworming or if they have bloody poop you could have a cocci outbreak. Corid will be good for cocci. Wazine can be used as a dewormer. Cocci is common is young chicks. Are their vents clear? If they are eating to fast and drinking they may spit up when they are lifted and the...