Can A Fantail Live With My 6 Zebra Danios Happily? If Not, Then What Will. 75L Tank/6.5Gall.

A 6.5 gallon tank is already maxed out if you have 6 zebra danios in it. Goldfish like your fantail produce quite a lot of ammonia and this would cause problems in such a small tank. Most fishkeepers start out with very small tanks when they first start getting fish. I started out small when "I" first started keeping fish. Might I recommend that you purchase a much larger tank? The reason is, because as you get more experience with your fish, you are most likely going to start wanting either more fish, or more varieties of fish. Regardless, always make sure to educate yourself about ANY fish that you are interested BEFORE you purchase. www.wetwebmedia is a GREAT websight that can give you TONS of information on caring for your fishes.