No. Unless you put it in a tank with sand.
Yes
um, no, not at all.
No. A one gallon tank is not appropriate for a singular goldfish much less multiple. A ten gallon tank is the bare minimum for a singular goldfish and breeding would require a tank of twenty gallons or more. A one gallon tank cannot handle the chasing that proceeds goldfish mating nor maintain a water quality that is suitable for raising goldfish fry.
No you schould not have that many fish in a one gallon tank. Thats the size of a big betta bowl. And because they are goldfish it is worse their poops are toxins
Goldfish do not get pregnant.
They prefer one.
Global warming
One goldfish needs a 30-gallon tank, and an additional ten-gallons per additional goldfish. Goldfish can grow to be 10-12-inches long.
Yes, some frogs are specialist frog predators. As a general rule dont mix frogs that are significantly different in size. If you think that one frog could fit in the mouth of another frog, it probably will. Dont over crowd the tank either. 3-4 frogs in a three foot tank would be plenty depending upon the size of the frogs.
Once a week :))))) i have experience
Intrusion..!
no goldfish and tropical fish cannot live together. gold fish are cold water fish and tropical fish are tropical fish. also only 2 goldfish can go in a 30 gallon, because goldfish make a lot of waste.