Welcome to the forum!!!
Your problem stems from the fact that there isn't enough room your tank for any
of these fish to be happy for long, much less two male gourami. Gourami can be very territorial, so they need their space. In a situation where they can't get away from each-other (as in your 30g tank) it can get bad very quickly. If
the tank were large enough, you *might* be able to get away with having two males, along with a 'harem' of females to distract them, but it's still iffy. Adding one female will only make things worse in this situation, I think. The poor girl would be harassed to death between both boys, and if they're being rude now, imagine how much worse it will potentially get when these fish come into breeding condition. . .! Unfortunately, a tank this size is simply not big enough for two males, even if they were the only fish in the tank.
That aside, I think you need a MUCH bigger tank before bringing any more (soon to be) large fish home. . . and to seriously consider returning or re-homing many of your current fish. . . A bit more research is required on your part, I suspect. Kissing Gourami can get massive - up to a foot long, while the other fish can max out around the 6 inch mark. There is just no way that you'll be able to keep most of these fish happy for long in a 30g tank. Too bad your friend didn't give you her 75!
If you'd like some help with suggestions for fish that would be happier in a 30 gallon tank, feel free to put up a thread! Everyone
around here loves helping out with new set ups - and to keep tabs on the inhabitants of the happy, thriving tanks that our friends create!
Hope this helped, and again - WELCOME to TFK!