Some questions about gold fish/tanks?

heavy_d65

New member
My tank contains, 2 gold fish, 4 tetras, and 1 cleaner fish


1. How often should I feed the fish in my tank? ive heard between once every 2 days - 3 times a day :S
2. I have a light in my tank? Should I leave it on all the time? Does It hurt the fish?
3. When I change the water, can i keep the fish in the tank while I put the cleanser thing in the water?
What other tropical fish (please include price) can I add with the tetras and cleaner fish if I seperate the goldfish and put them in a bowl ...
Alright I will buy some more tetras, and If I leave the light on can that act as a heater? and how much do they cost, also my goldfish are 2 inches, and my tank is around 20 inches length X 12 inches high x 10 inches deep , not sure how many gallons it ho;ds
How do tropical fish and cold water fish differ, does one need a heater? All answers are greatly appreciated
 
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