You can add Guppies, Mollies,Neon tetras, algae eaters,sword tails,and African water frogs (also known as African clawed frogs, but they don't claw the fish)to name a few.If you do add an African water frog, be sure to have a lid on your tank. To add flair, you can add mystery snails, clams or ghost or cherry shrimp. You can also put an angelfish or angelfish pare, but to be on the safe side, don't put anything to small in with it because any fish that has a mouth big enough to eat another smaller fish will usually eat it. Fish do all have their own unique personalities though, so if you get a shy angel he might not bother smaller fish. angels can get 7-8 inches long and 10 inches tall.If you plan to get mystery snails, don't add a clown loach because they will snack on the snails.
No
If the temperature is around 20 degrees (Celcius) probably not. But for a five GALLON fish tank, probably.
Its not recommended to do that, but guppies are very hardy fish. So if you were to make sure not to over feed, and to clean the tank frequently, then yes you could keep 6 guppies in a 3 gallon tank.
Betta fish, guppies, tetras.
It's recommended to keep 1 inch of fish per gallon of water. Guppies usually grow up to 2 inches in size, so you can keep around 4 guppies in an 8-gallon tank. However, remember that factors like filtration, water quality, and tank decorations also play a role in determining the suitable number of fish.
Almost any community fish will do fine with guppies. Bettas are not a good idea with guppies because they will fight each other.
No, red tailed sharks get too large to survive in a 1 gallon fish tank. Only very smally fish such as endlers or guppies, or a betta, would be ok in a 1 gallon aquarium.
Provided the tank is large enough to house them all (1 inch of fish needs a minimum of 1 gallon of water) Guppies and Bettas should get along OK.
If you have six pregnant guppies then yes, they will give birth in your five gallon tank. That tank is not big enough for all of them to live in and the guppies will keep having babies. You will have to give them away, sell them back to the fish store, or get a much bigger tank if you plan to keep them.
no
4,000
I would suggest upgrading to a 10 gallon tank.