I have the Japonica shrimps in together with the Atyas in a 10 gallon tank. The Atyas are still young, so there is plenty of space there for them.
In the tank there is a mopani wood with java moss. The female Japonica are with eggs and I have larvae in the tank as well; the Atya filters the larvae of the Japonicas (a win-win situation here). The questions here are:
a) Do I have to remove the Atyas once the Cherries come in (I have ordered some Cherry Shrimps)?
b) Would it be okay for the CS to remain in the same tank as the Atyas or would it be advisable to remove the Atyas?
Much thanks and sorry for the multiple questions here.
It is hard to imagine shrimp that small with those tiny little pinchers doing any real damage to each other, hehheh. I have seen ghost shrimp try to pinch my amano shrimp though (usually at feeding time) and also try to get at the eggs on the underside of the amanos. Fortunately, I don't think they ever had a single success at either. I would hardly describe that minor aggression as dangerous.
I had a species of shrimp for a while called a yellow-claw shrimp, which I believe might be a macrobrachium species. They were about the size of a crayfish, except with long arms and very small pinchers. They would chase any fish out of their little caves and if either of the other shrimp ventured too close to the other's home they would chase each other back and forth. Unfortunately, when I took down my tank and put them in a 40 gallon rubbermaid tank for holding for a couple days, they were very quickly lost.
-Aphyosemion