37 GALLON STOCKING ADVICE!?

Its slightly overstocked. I think you should be okay, though, if you have a good filtration system, and you may have to do water changes more frequently. If you wanted to lower the numbers at all, I would lower the corydoras to just 4 instead of 6--but still, I think you'll be fine. They should all get along pretty well, the only thing you may see is some aggression from the gourami to the platies. Gouramis are considered community fish, but the truth is that alot of them have an attitude and may still end up bullying another fish in tank; it is especially true of the Trichogaster species (Blue, Gold, Three Spot, Moonlight, etc) that they can be quite aggressive, so any time you keep one of these gouramis, you take a chance. But it may be worth taking, especially for one as breath-taking as the Pearl. Do NOT keep it with other gouramis. He will be less aggressive if on his own. If possible, choose a female, she may be less territorial. Keep an eye on the gourami when you put it with the other fish....some chasing may be normal at first, as fish establish dominance and territories; however, if it persists and you see a pattern, take that gourami back, because he probably won't let up once he gets his eye on an easy target. One way to avoid this would be to introduce the gourami after the other fish, so he knows his place as the new guy.