Do you have a place set up for them to sit below the current in your tank? This is the easiest place for them to feed.
Unlike vampire shrimp, these guys cant move their fans around to catch food and need the current to push it into their fans. So they sit in the current.
Take a small twig of driftwood or a dried oak or beech branch and take a suction cup and place it right under the filter outlet on your tank. It may take a bit for him to find it, but eventually he will.
Take crushed flakes or crushed powdered pellets and drop it right into the current under the water for him.
Also, they like companions, so look into getting a couple more bamboo shrimp
Culturing green water for them is also a good idea as they feed on this in the wild too. Most bamboo shrimp are wild caught so are a little difficult to care for compared to other shrimp.
But he really needs a current to feed. You may find he will hide during the day and come out at night, so check about an hour after dark and you may see him out under the current. This is the best time to target feed them.
Even a branch going up into the current is good. Mine recently found the inlet tube of the filter and sat there lol
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