Please take a look at my aquarium, thx.

To help ya figure the space needs for your goldfish. A fancy goldfish usually needs at least 10 gallons...per fish. Comets require much more becuase they need a lot of swimming room.
 
Re: reply for hihelllo

Hi hihello,

Well, the benefits of adding a light are mostly aesthetic for a tank without live plants. The fish will be more colourful, and probably more responsive and active in a lighted aquarium. I have also been told and/or read that fish require light to help utilize a certain vitamin, but I am not exactly clear on that. Perhaps someone more knowledgeable in this matter can clarify this point for us.

Yes, I would also add an extra Tetra power filter rated for a 10 gallon tank. I know you will need the extra filtration, moreso as your fish grow.

With a goldfish tank, especially one with a higher bioload, I would change the water more often, about 25% every 7 days. I do water changes on all my tanks once a week, with varying percentages depending one the tank and the bioload.

You have a good feeding routine, the same one I use with my aquariums. Yes I agree, I would try to incorporate a more varied diet. I use spirulina pellets for goldfish by NutraFin Max in addition to goldfish flakes. There are algae wafers which are also good for goldfish.

I hope you are enjoying the hobby so far!

:) :) :) :)
 
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