If you can find a good deal from a local red cherry breeder, check it out. In the long run the like 30 bucks for a dozen can be worth it if they manage to breed. Anyways, besides having the glass shrimp, with another axie I have the red cherries, so casualties so far. They are much faster than the glass shrimp, like little water bees and they keep my tank very clean. The think is i found out, the ghost/glass shrimp will eat left overfood such as pellets and worms, but I have not witnessed the cherries doing such clean up seeming they are significantly smaller.
I'd be careful with some of those suckerfish/catfish, some have spines that will not feel good in an axolotl that swallows it. Hopefully someone with more experience in that field will reply to you soon.