I've Rhinogobius duospilus (used to be wui), with RCS. They'll will hunt the shrimp. especially the younger ones will be eaten. But given enough places to shelter RCS will survive, don't expect too much offspring though. My topic (on another (dutch)forum) has pictures of the gobies, dario's shrimps etc.
http://www.venividivissie.org/viewto...&sd=a&start=15
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