Never heard of a red flame gourami? Like absolut said, it's most likely a Dwarf. I have a m/f pair in one tank, and when they are out with fins extended, red is the dominant colour with blue stripes.
Any way, Dwarf are known to be the more aggressive of Gouramis, but mine are fairly calm. There's also a Blue x2 the size in the same 90g, but the blue is very calm. So they both leave each other alone, eat beside each other, just have their own territories when resting. When they cross paths, they circle each other, the dwarf extends and brightens, but they eventually swim apart. I'm sure they nip once in awhile.
As for the Pearl, he was in the same tank, and bullied everything. Nothing bothered him though. For this reason, from my experience, I wouldn't put a Pearl in with a dwarf. The pearls now in my 20g with tetras and glass catfish.
If you still wish to risk it, get them both very young. Gouramis get old and grumpy fast, so having them grow together may (or may not) help them get along a bit better down the road.
As for the other fish, you should be fine. Just keep the danios and kuhlis in groups of 5 or more. My
LFS puts a really good deal on kuhli loaches twice a year, so I have a bunch lol