I fed my Neocaridina denticulata sinensis with cooked carrots but they didn't spend much time eating it. They rather feed off of the aquarium glass and from the Oak leaf litter. I am observing them very closely for the last few weeks and I believe that their main diet is formed out of microorganisms, algae and fungus, rather than boiled veggies and algae wafers. Just a few days ago, I fed them with a small piece of algae wafer but they didn't eat all of it, instead they were picking "things" from the stones, leaf litter, glass, filter, plants and gravel. I am prity sure shrimps will do much better in mature set-ups, where aquarium mulm has been formed.
And since they enjoy eating microorganisms from the Oak leaf litter, I collected some more from a near by park. I am soaking them in a bit of dechlorinated water, so they sink readily. The more leaf litter, the more surfaces for the microorganisms to grow on. I will try to collect more withered Oak leaves before the season is over.
Photos by Dusko Bojic.