03-05-2007, 05:12 AM
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Actually, the glo fish are technically still the same species as zebra danios, so they will act exactly like zebra danios (whatever that means) I once had two zebras in a tank and they were fine, would chase each other around constantly. I also currently have five in my tank now, it was six, but one always separated himself from the others like iPesci is describing, he wouldn't eat no matter what I fed or did, and he wasted away until I had to euthanize him.
But back to the glo fish vs. zebrafish behavior, glo fish just have a fluorescent protein gene inserted into their genome. I work in a lab that does this with mice all the time for research and it doesn't change their behavior at all. He will also recognize other zebrafish as the same species. Sounds to me like you just got a sick fish, unfortunately, it also sounds like fish TB, but maybe he just needs time to adjust. Give it some time, and feed him something that he'll really like such as frozen bloodworms.