So Red is definitely a boy ... Goldy may or may not be a girl but he thinks s/he is ... Watch that his antics don't become too bothersome and exhausting - more bunnches of plants for cover, and in the last resort a tank divider can be used!
The brown diatom algae is very common in newly set up tanks, it should pass eventually. Meanwhile just wipe it off as you say - or there is a very superior algae scraper you can getThis one on sale eg here