| Whoa! someone said the Jack Dempsey was okay!? That's crazy. I worked at petsmart for two years, and that is a BIG NOOOO! Okay, let me break it down for you... You have a few classifications of fish these are, Goldfish, tropical fish, Semi- aggressive and Cichlids. Only alike kinds will mix. Even though golfish and tropical fish are nice, the goldfish will raise the ammonia levels in the tank, and because tropical fish are sensitive, they will die! Gouramis are kind of border line between tropical fish and semi aggressive. Meaning, they are able to hold their own with semi aggressives, and are not that aggressive themselves. It actually depends on the individual fish and how aggressive he is. You have a tropical tank, so i would stick to that kind of fish without trying to risk anything.
A suggestion of fish that will do good with your tank:
more guppys or plattys, or neon tetras (you'll have to get three or more, as they are schooling fish, but they are a very nice addition!) If you have a pet store in you're area, such as petsmart or petco, you really should go there. I know from my own experiance and that of my customers, at Walmart, they do NOT know how to even care for their own fish! They give them chemicals to brighten the fishes color, and then the fishs life span is decreased! Its horrible!
Good Luck!!! | 
One died and the other was eaten after I purchased a Jack Dempsey Cichild from Walmart. The tank said they were community fish but they obviously aren't.
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