Nothing, if you want to be humane. Goldfish take at least 10 gallons each fish because of how much waste they produce. Most fish are the same.
but there is one fish a betta i had mine in a 1 gallon tank for 3 years and its been fine the only thing is that you have to clean it out every 3 weeks.
There are not many fish you can have in a tank with no heater or filter, but, I have a few combinations that will go together. Betta fish or Goldfish are a primary choice that you should use. Do not put more than 1 Betta in a tank, or with Goldfish, there real same
"Siamese Fighting Fish" should tell you why. with the primary fish you should have Catfish, Plecos, or both. I recomend Catfish because they will clean the bottom of your tank really well so I would buy 2 along with a Pleco that usually eats off of walls. Lastly I would have a Snail for decor, optionaly a African Dwarf Frog wich is only a bit harder to take care of because a Betta will eat its food some times, also have some plants and maybe a moss ball. I hope this helps. -Axel
you can put a betta in a 5 gallon tank
That is small better stick with a goldfish.
You could put the following: 3x Neon Tetra or... 1x Betta
normal rule for fish in a tank is: For every 1 inch of fish there is 1 gallon of water
In that 150 gallon fish tank try to put fish and maintain it
You can put it on a table if you choose. NEVER put a tank on the floor.
No
Yes.
You don't! What you do is get a 55 gallon tank because angelfish won't be happy in a 10 gallon tank, and then you take the betta out of the tank (it will fight with your other fish) and just get more mollies and put lots of hiding places in the tank so the babies will live.
A 1 gallon tank could have one betta fish, but you will need to be diligent about changing the water on a regular basis. The smallest tank that should be used, even for a betta, is a 2.5 gallon tank as it at least gives the fish swimming room.
Danios or glofish would be a good fish to put in the tank. They are schooling fish which means you would need at least three and I wouldn't put more than 5 in a ten gallon tank.
The fish are not bad together. But way to many fish for a ten gallon tank. You put one fish for every gallon. They will probly do fine but you will have to clean more.