15-20 cardinal tetras
7 Glass catfish
5 Bosemani Rainbows
1 bristlenose plecos
1 German Blue Ram
1 Pearl Gouramis
1 Apistogramma cacatuoides (Double red)?
3-5 male guppies?
6 or 7 Albino Corys
A bunch of amano shrimp and nerite snails.
I'm concerned about getting a pair of Apistos, Pearl Gouramis or Rams due to their behavior when mating. I've read that they can become aggressive which is why I went with one instead of a pair. Experiences?
I have 2 pair of gold rams (and they are mated, breeding pairs) in a 46 bow with angels, tetras, plecos, cories, a couple guppies, celebes rainbows, and a plaket betta. They have their territories that they'll keep other fish out of if they have eggs (which pretty much lasts until the lights go out at night, then no more eggs), but otherwise, they're perfectly peaceful with their tankmates and each other. Honestly, my male guppies are bigger bullies in that tank than anyone. I've had gbr's and electric blue rams in that tank in the past (as well as in other tanks) and I've never had any real aggression issues with them. I've been told that rams are "social" fish that do better with a mate, and whether technically true or not, I will say that I have had way better luck with them when I've had a male/female pair in the tank vs. two males, two females, or a single ram.
I would still worry about the pearl gourami a little bit with the rainbows. They occupy the same area of the water column, and the rainbows are fast, aggressive eaters that very well may out compete the gourami.
Also, just a caution - there's a fairly good chance imo that your shrimp are going to get eaten when the rainbows get mid/full sized. I've got them in most of my tanks, but they didn't last long in the 46 mentioned above or my other tank with angels. Would assume a similarly sized rainbow would do the same to them that the angels did.