Can these cold water fish stay together in a 18'' by 8'' fish tank?

Questions2Ask

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I have a ClearSeal fish tank and its a bit larger than a regular computer screen. I really need to get fishes urgently because im deseprete! I wanted:
1 fantail goldfish
2 black moors
5 tetras

I dont know how big these fish can grow. Can you please tell me.
If these fish are not compatible can you name some that are.
I have a cold water tank and I want it to be filled with lovely fish.

I think some tetras can be tropical but which ones are coldwater?

I am a beginner in the fish pet keeping ... Please help me thanks .
 
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