characins are in fact not gar at all. your thread will probably me moved to a more appropriate forum, but to answer youre question in short...i think they would be ok with the tankmates listed, as long as they are not too aggressive.
The Hujetas, at least mine anyway, can be a little skittish. They can also be territorial with fish like themselves unless you match their size or have something larger.
My advice is to try it out. As long as they have enough room to themselves in the tank they should be okay.