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.
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
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.
Yes.
No
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.
Remove the sick fish..... the fish that has the ich should be put in a hospital tank then treated for ich, corals do not get ich, only the fish, so a ten gallon tank with a aerator would be ideal for a hospital tank....