03-13-2007, 04:49 PM
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Well, your current set up isn't compatible with your current set up. (At a minimum, the violet gobies are going to have drastically shortened lives - they need either brackish, or just possibly, very hard water. Depends on whether they can use calcium as well as sodium to regulate their interal pressure - I don't know if they can or not.)
Leaving that aside, and assuming you have more or less neutral pH and Medium hardness water the only one on the list that I'd try would be Bolivian rams. The Blue/Gold rams need softer, more acidic water than your livebearers will enjoy (or your gobies will survive). If, on the other hand, you have hard water (which will probably shorten the tetra's lives) you might want to think about Firemouth Cichlids. They get a little larger than you want, but you could look into them.
Now Yellow labs also like hard water, but they like a particular hard water. You'll need to read up on African Rift Valley cichlids to get a really good answer on this.