For Cories, or Corydoras, they are happiest in a group of 4-6. I'm not really sure about about the other fish you're interested in, but you shouldn't have more than a pair (male and female) of Angel fish. If you don't want them to breed, then you should only get one. I have heard that they're very aggressive.
Most cories stay at about 3" in size. Panda cories are among the smaller cories and only get to about 2".
As for tetras and angelfish, I wouldn't advise that. The torpedo tetras will become food for the angels unless you do the larger sized tetras such as penguins. Deep bodied tetras (Serpae are notorious for this) tend to get nippy which the angelfish don't tolerate. The penguin tetras I've noticed are somewhat nippy, but only in their school, but also are very fast at getting food. The rainbow fish are as well. Angels are pretty intelligent and know where to go to get food, so I don't think that would be too much of an issue.
You may want to just do the rams, angelfish, rainbowfish and cories. 37g isn't going to be that large if you do 3-4 angelfish and 2 ea of the rainbows and rams. I would suggest that you plant the tank fairly well. Java fern on a piece of driftwood will help soften the water for the angelfish/rams. You can also add some wood shrimp to help filter the water and help the substrate
Penguin tetras do get nippy oftentimes, however, this shouldn't stop you from keeping adult angels with them. Young angels however may have their fins ripped by the penguins.
What rainbowfish are you going to keep? You have never mentioned the species. If you can remove the angels from your list, threadfins will be fine choices. If not, stick with praecox rainbows. Bigger rainbows are best kept in long tanks. Plenty of room for them to swim around.
If you are interested in breeding, keeping praecox rainbows only will guarantee you plenty of fry in a few months provided you have several plants for the fry to take cover. These rainbows are one of the most prolific species.
Boeseman's Rainbowfish are relatively peaceful (except in my tank for some unknown reason ) and would make a good addition, specially since they will help disappate some of the energy from the cichlids when they spawn.
if i were you i would stick to what youve got now. my angels have grown sooo big are the size of my hand and growing. i have a 55 gal with 5 angels and they do just fine with my rosey tetra and my two tiny neons. be careful with feeding though in a tall tank you might want to buy some food that sinks because the angels will eat everything!!
Your rams will occupy the lower tank space. If you have enough space for caves and vegetation, you might be able to get away with 2-3. But make sure there are hiding spots for the cories.
Yeah I got some caves and some birchwood down there. The angels havent really taken up the top of the tank but have been in the middle. The tetras are mostly at the middle and top of the tank.
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