Thanks Steve - sometimes it is tough to take a step back from our favorites species to ensure everyone can peacefully coexist.
I think I'll just stick with the spotted and not introduce any other dragonet unless I can somehow get my current dragonet sexed and find one of the opposite.
Sexing is easy (except for one problem). The dorsal fin on males is spiked; the dorsal fin on females is not (normally rounded). However, I have seen dealers cut off the spike to "create a female" morphologically but it does not fool the other dragonet, just the buyer.