Thanks for the good info Byron. I'm new to this hobby (about 4 months).
I'll respond backwards to your post.
The lighting is a Hagen Marine-Glo T8 24" 20W 650 Lumes (the Kelvin rating is blank so not sure what it is, I've been trying to find something but haven't ran across anything yet will keep looking). I did read somewhere that this is a good bulb to use in combination with one of the other ones (Flora-Glo 2800K, Sun-Glo 4200K, Life-Glo 6700K, Aqua-Glo 18000K, and Power-Glo 18000K) depending on what you are trying to establish.
Now as far as the stocking,
I get all of my fish from the same LFS and whenever I go there I make sure to talk to the owner (who own another store across town). He seems to know quite a bit (which I would hope he does since he owns/works at a fish store) compared to some of the employees. I asked him about the WP when I was buying the fish (which he guarantees his fish other then death due to aggression). What he told me is that all of his freshwater tanks are filtered/cycled through the same system so all of the fish there have "just about" the same WP. He also told me that the fish he buys are bred in very similar WP and the reason being that this allows him to basically stay in business due to being able to sell his fish to just about anyone and guaranteeing them. Now obviously, yes naturally the fish would probably be happier in those WP, however they are used to these WP and I've had them for a week and they are all acting fine and look happy. I have quite a few more things in the tank for everyone to hide.
As far as compatibility, I know certain fish don't get along with others but there is always that small possibility that they will. The tiger barbs and gouramis were in the same tank to begin with and grew up together so they get along great. The barbs tend to stay on the top right hand side of the tank where the cichlids stay in the bottom left and the gouramis just kind of swim around everywhere and don't get bothered by any of the other fish. When they are feeding all of the other fish move out of the way of the gouramis which I thought was a little strange since the barbs like to swarm the food like piranhas.
I hope this provided a little more information and hopefully I get some more input from you guys/gals. I know you said return the cichilds, but I really like them and the kids love them so I think I'm going to leave them in for a while longer and see if anything changes. If it does I will definitely return them and like I said the owner of the LFS has been really good with me and said he will have no problems taking them back (dead or alive unless they get killed by the other fish or my tank gets too filthy and nothing can live in it).
As far as putting anything back in the 10 gallon tank, I don't see that happening because the other half saw the painted glass tetras and she just had to have them so they are in there now lol.