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hey just want to say it good idea that you separate that male from your mail tank. Every time when fish sick or you buy new fish always quarantine it so it don't contaminate the tank. And also your fish was darting you wrote. It can be a few different reasons which is something simple like if you didn't acclimate him right to something serious ich. And if fish has ich he will contaminate whole tank. I hope it not ich. Sorry for the mess just want to warn you I hope your bettas doing well