Mixing Gourami

In theory they should be OK. Pearl gouramis are less aggressive than some other species, though male dwarfs can be a bit nasty. The only thing I would caution about is health problems with dwarf gouramis. A lot of them already have the incurable dwarf gourami iridovirus when bought. Make sure the shop tank has only healthy gouramis in it. If there is any sign of a sick or dead one, don't get them from there.
Make sure you have tall plants or other decor to beak up their line of sight. And keep an eye on the dwarfs as some males can harass a female to death. A trio of 1 male 2 females is better than a pair, though for some reason shops tend to sell this species as pairs only.


The gouramis that cause most problems are varieties of three spot. This comes in many different colours and people who are unaware of this can end up buying two different coloured males, resulting in a lot of aggression. Males of this species can also be aggressive towards other tank mates.


The ultimate plan sounds fine