No you cannot put a frog with goldfish; goldfish belong with goldfish
The fish will be living alone in the aquarium. And that's ok.
plastic plants are not harmful to your goldfish aquarium.
no it would probbably jump out them go round the house. LOL :)
Yes, goldfish can breed in the home aquarium.
yes
No, but gravel can help decorate and brighten an aquarium.
It will not matter. The only difference will be is that your fish will get bigger in the aquarium.
Just leave the aquarium at room temperature.
the answer is nothing ok
they can't
I think it doesn't depending on how much you put in the water. My class put goldfish in a cup with water and BTB. It had absolutely no effect on the fish.
Sure. You can put a goldfish in anything that can hold liquid. But the best thing to do is to put it in a tank with a pump so it gets oxygen. I don't recommend leaving a goldfish in a cup for a long period of time.