I think I recall reading that green shrimp and blue tiger shrimp will interbreed, but according to this chart that I just found, they do not??? I thought the rule of thumb was to keep the species separate for purity...
http://www.crustaforum.com/images/crossbreeding_big.jpg
http://www.crustaforum.com/images/crossbreeding_big.jpg
I posted something here in the wrong place. Meant to make a new thread and now I can't get rid of this message box now... Just pretend this isn't here! lol... Uhm, anyone on the caridina crossbreeding???