Hi there, thanks for that I will keep them in mind for the next fish I buy. I dont think my neons are doing to well they always look like they have a flicking movement going on. The garamis were my boyfriend choice even thou they are not as cheep as neons, guppies ect they are quiet hardy fish we have found. They always look happy and dont catch white spot like the smaller ones. How are your tanks going are you having any sleep with all that noise of the pumps ect?Never had expericne with gouramis. So you'd have to read up on that.
I'd say platies were quite hardy. I got 7 of them in a 5 week old cycled tank and they were fine. However do some research, there may be community fish that can tolerate a wide range of pHs and nitrates etc.