About the smallest sized tank I would advocate is 24"x 12"x12". The hard thing is not the breeding of the Bettas the hard thing is finding the room and facilities to rear the hundreds of baby fish (fry) that you will get from one successfull spawning.
I would say a Tetra 1.5 gallon tank. It works well for a pair.
No. A 10 gallon tank is barely big enough to keep a single goldfish in.
Yes
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.
godfish can be any color-not just gold. yes u can put them together if they r the same breed (goldfish)
Fantail goldfish are a hardy breed, strong swimmers and they compete well for food with the ryukin, shubunkin, comet or common goldfish; making these goldfish breeds good tank mates for your fantail goldfish.
Yes! But seriosly, the rocks wont make any difference!
Yes, goldfish can breed in the home aquarium.
Not happily or healthily. Those goldfish need at least 30 gallons of space to live happily and have a long life. If you do successfully breed your fish, remember to remove the babies ASAP. Goldfish like to eat their babies.
Goldfish cannot live in bowls. Fancy goldfish need at least 20 gallons for the first fish, and 10 gallons minimum for any additional goldfish. This means that for two goldfish, the smallest tank you should have is 30 gallons.
Usually Goldfish breed spring and early summer
Yes
The smallest breed is the robo breed.