01-31-2007, 07:46 PM
Join Date: Oct 2005
I would really caution you about the rosey reds. As six said they are a coldwater fish so the warmer water kicks them off fast. One of the teachers I had in high school used to keep rosey reds in a fridgerator in a rubbermaid container. Suprisingly, they lasted a long time and they seemed to be few losses. Goldfish are coldwater fish too. You probably shouldn't be using a heater for these types of fish, or if you do it should be turned way down. The standard 77 is too hot.
The other types of fish to steer clear of (or at least not to mix with tropical fish) are brackish water fish. They need a mix of saltwater and freshwater so they don't go well in plain freshwater. Swordfish are mildly brackish water fish but can be acclimated to freshwater. I've never had good luck with the ones from the stores but the acclimated ones I bought from individuals did ok.
Zebra danios are the ultimate fish for cycling a tank or just to have anyway. They are incredibly cheap and are pretty easy to keep. I bought about 15-20 of them from Petsmart to cycle a 55 gallon tank and only two died off. I was really impressed at the time because I had lost several much more epxensive fish when trying to cycle other tanks.