Oh man I wish I had access to all these different shrimp types. Not sure why I just love these little critters ;)
I understand that. Be careful, shrimp keeping very often becomes addictive!!
Your in New Caledonia? Had to Google it. Never heard of it before. If your there I guess its hot enough for outdoor shrimps.
Pretty hot place. During cold season, outdoors temperature can go down to 8~6 °c during night and 24°C during day, but in summer, lower temp at night are rarely lower than 17°C / night, and up to 32/34°C during the day.
I believe 18°C is really affordable for them, especially the red cherry which is very hardy, and so are the other Neo Caridina.
I have my Neo hosted with local Paratya and Caridina Typus, bigger than cherries, with no problem. As for the Ghost shrimp I don't know, but like you say, if not sure, better be wise and not mix them.
Here are some pictures of mines:
My orange
My red doing some cleaning on a fern i just introduced in their tank:
Some local "pseudo" Black Crystal" we can find it in the south of New caledonia. Very nice, but very difficult to succeed in the tank...
I have googled your place too, it looks a very nice place. And you have good chance to live very old according to the reputation of your place ?