AqAdvisor threw up a lot more red flags at that stocking than it did mine.
Cichilids have a very high bioload, I know that- so definitely need good filtration. Apparently Kissing Gouramis get huge, so be ready for that. I have 2 in a 55 and I'm prepared to get a 75, probably 125 in the next 2-3 years.
AqAdvisor recommends no less than 5 madagascar rainbows in a group, but I lack experience in that. Pearl Gourami isn't recommended with kissing because of fighting, but I lack experience with that and I suspect room for territories would be a remedy.
How do your barbs do with your gouramis? I have 15 in a 55 with 2 kissing and BN pleco, adding a rainbow shark this week, so it's a similar community. I think I may have too many barbs because 1 or 2 keep picking on the larger gourami when he's trying to eat.