Feeding shrimp - they aren't the smartest, are they?

A few weeks ago got 2 Japanese shrimp for my 20 gallon tank (also have
3 golden barbs and 2 leopard danios - this was the tank I took over
from a neighbor).

They have done a lovely job of cleaning off the algae on the big piece
of driftwood in the center - and now are working on some algae growing
on the tank.

My question is: any tips on feeding them?

I have algae tables - I've broken off small pieces. At first I was
just throwing them in the tank - never made it to the shrimp as far as
I can tell.

I've started literaly handing the pieces to the shrimp - putting my arm
in the tank.
They seem to be getting used to the hand in the tank. However:

1. If I put the piece close to them - they seem to figure out it's food
about 50% of the time..... otherwise they move off.

2. Sometimes the other fish see the tablets and go for it.

Anyhow... I'm looking for shrimp feeding strategies - since the algae
will be pretty much gone soon.

Any ideas?

I really enjoy having them in the tank.

Alec in Providence