Gourami And cory and albino bristlenose plecos questions!?

I have a 40 gal and a 20 gal. The 20 gal has 8 guppies and 5 albino cories and 1 male blue neon dwarf gourami. How many females can go in their? Could another male dwarf gourami go in their, or ..(wat other Gouramis are friendly to guppies-community fish). And in my 40 gal, I have tetras cherry barbs, albino cherry barbs, panda platties, 3 guppies and 1 male flamming dwarf gourami. How many females could go with him? R they guaranteed to mate? Wat if there's no spot for them to make a bubblenest? ( I want more Gouramis but not really babies) wat other Gouramis could go in there with my male and community fish? My tank had a little temperature change (it went down) when I left my window open for the night. I read that that would sparkthe mating of my albino cories cuz it replicas rainy seasons or something. I'm not sure if my females are pregnant. Wat are some signs of pregnancy and labor and egg laying and stuff like that. Basically- how does their reproduction system work?And my albino bristlenose question is, I have 2 in my 20 gal and 2 in my 40 gal, when will ik if they are male or female, Ik the males grow whiskers, but how long does it take for him to grow those? I've had them for a little more than a week. Is their any other signs of them being a male or female?