Bettas are not good in any community tank, in my opinion, and definitely not with these fish. They are temp-incompatible, and the barbs and gouramis in particular are especially bad tankmates for bettas.
There really isn't a magic formula for stocking a tank. Aqadvisor is just a weird calculator thing, which makes no sense because you can't really put a specific number on the %age of bioload a fish has. The fish per gallon rule is inaccurate because it also defies logic, such as a 10 inch fish...
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I wouldn't add any more fish. Aqadvisor is not accurate.
Mollies, neon tetras, and dwarf gouramis need a bigger tank. ADFs should not be kept with fish.
If you add anything, I would suggest shrimp or snails.
My biggest problem with it is that they scrapped the EU, which I was invested in and still care about, to invent new canon, which even without losing everything from the past I still think is not objectively good..... just my opinion with that though, I do admit to being biased lol.
The gourami is a sparkling gourami, Trichopsis pumila. The minnows, not exactly certain, but I would bet they are fathead minnows/ rosy red minnows (they're the same species, Pimephales promelas). The cichlid I think is a faded Apistogramma cacatuoides.
In my experience it's hard to put most 'mid-top' level fish in a box when it comes to their activity level, yes they go all over the tank. There aren't that many that stay on just the top, hatchetfish being an exception, African butterfly fish being another.
I think a gold gourami would be...
I keep having problems trying to post, and just odd issues in general. The forum is very slow and the reply box is not showing up at the bottom of the page, and I keep getting error messages. It seems like there's a new error every time I come on here.
It lets me post this thread though.... idk...
The cories and black/white skirts are schooling fish and should be in larger groups of their own species, I would up the group of black and white skirts and cories so they can feel more safe. May help the gourami not to mess with them as well.