I used to have 20 pcs in my 4ft tank 2 years ago. Now left about 7-10. They are really monster shrimp now, bigger than most of the fish in the tank. Though they are quite ok with the fish, maybe used to the fish since they were young.

I find that they do not take algae anymore reaching this size. Also always bully smaller shrimp if you put in new one. None of my new bought smaller yamato survive!

Yeoh