breeding goldfish

Question
Why aren't my goldfish breeding?
I have a I'm (length) by I'm (width)tank with 4 strong healthy goldfish, 2 peaceful Mollies and 1 shy fancy-tailed guppy and a shy snail. None of the fish are the least bit aggressive. I feed the fish flakes. They happily eat them. I have a good filter which i clean once in a while and i usually clean the tank. The goldfish are not very big but since iv bought them they've double their size. The are peaceful fish. I have a bubble maker, in case the need extra air. The tank has a pre-installed heater, light and filter. I have no real plant life in the tank, only a fake palm tree, some little rainbow colored pebbles, 3 medium sized rocks, 2 big sea shells, a spawning mop and fake black seaweed. I cant figure out why the goldfish wont breed. I hope you have some tips on how i can make them breed. PLEASE get back to me ASAP (as soon as possible)!
By the way iv had them for almost a year.

Answer
hi Manahil,

Goldfish breed in the spring/summer, but usually not in the winter.

I don't see a size of the aquarium.  Could you write back with the size in US Gallons?  All I see is "length" and "width", but no inches or dimensions.  

The goldfish will breed most often in a pond, but tank breeding is not rare.  They breed, however, far less often in the tank than in a pond.

Males will develop tubercuoles by the gill and on the fins, and those are like growths.  That will help you to figure out who is a male and who is not.

They sexually mature around a year old, they say, but mine took longer.  

Dimensions of the aquarium and how often it's cleaned will play a lot into their breeding.  If it's not large enough, they may never breed in it.

Last, but not least, food and clarity of water have a lot to do with how often they go into breeding mode.

Clean, crystal water is a great way to induce breeding.  

Keep the filter nice and clean (bi-weekly to monthly) and they should begin in February to June, once you begin adding fresh, distilled water.

Mine were in a pond.  When I raised them.  I provided crystal fresh water, soft sedate parts of the pond, as well as flow.  I also provided floating plants with broad, wide leaves.  They love this.  Try putting a water hyacinth in next spring.  See if that doesn't help

Good luck!

Renee