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I added 6 chili rasboras to my 10G RCS tank not long ago. They are a beautiful addition to my tank due to their bright color and liveliness. 10G is clearly enough room to hold 6 chilis; in fact, judging from their behaviors there is enough room for 6 more. Although they are peaceful community fish, the tank needs dense plants / hiding places for small shrimp. I have seen my chilis chasing after shrimplets, but I have never seen anyone being eaten. My shrimp colony size has been growing.
I suggest no more than 3-4 chili rasboras for your 2.5G or 3.5G. Introduce them into the tank and see how they do. You should have some plants to provide hiding places for RCS; on the other hand, plants should not overcrowd the already limited open space for the chilis. If possible, I still recommend to go up to 5G or 10G - both rasboras and shrimp would be happier!
I suggest no more than 3-4 chili rasboras for your 2.5G or 3.5G. Introduce them into the tank and see how they do. You should have some plants to provide hiding places for RCS; on the other hand, plants should not overcrowd the already limited open space for the chilis. If possible, I still recommend to go up to 5G or 10G - both rasboras and shrimp would be happier!
