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Old 03/07/2020, 08:44 AM   #2
Michael Hoaster
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Join Date: Feb 2004
Location: Boulder, CO
Posts: 4,870
I don't think you can. Usually, you can put two together and watch their behavior. Spawning behavior looks more friendly than same sex behavior. Sorry, that's not much to go on, but try out some pairs and you'll get an eye for it.

As many naturalists and environmentalists have suggested, we should set aside our arrogance,
our desire to conquer and control everything, and walk hand in hand with Mother Nature. -Walter Adey

Current Tank Info: 180g Seagrass Sandbar Lagoon, START DATE November 28, 2018
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