12azor
Fish Fanatic
I went today and gave my local pet store the 3 goldfish that I had in a 20 gallon tank. I plan to turn this tank into another tropical fish tank. Do I need to start all over and empty out everything completely? Or can I do a water change and leave the gravel there? Is the good bacteria in my goldfish tank ok for tropical fish or is it harmful? How should I go about safely switching it over to a tropical tank? Any suggestions?
I think you're better off washing/boiling the gravel from the goldfish tank just to make sure there are no bacteria that could harm tropical fish. I would then take out some water from your current fish tank and add it to the other adding dechlorinated water to both. Then add some filter medium from your current tropical fish tank to the filter of your new one.
Leave the tank for a few days will the filter and heater running and it should be all ready for the new fry.
Get a second opinion though, not 100% that some of that is all right.