You don't have many options, as that is a very small tank. One betta is an okay option, although they really should have a bit more room. You can get invertebrates such as a shrimp or a mystery snail. And make sure to heat the tank if the fish/invert is tropical.
I would do a week or two with or without conditionar with nothing conering the top
Two gallons
4 or more or less. Depends on the size of the fish. Usually 1 fish per 1/2 gallon.
Can !out use two what in a ten gal fish tank. Need more info.
Technically, a 2 gallon tank for one Cory cat, 4 gallon tank for two Cory cats, and so on. The rule is one gallon per one inch of fish and Cory cats can grow to two inches, although the bigger tank the better. I would DEFINITELY not recommend a 2 gallon tank with one Cory cat. They like to be in groups and will be happier and healthier.
No you should not 2 bearded dragons should be put in at least a 75 gallon tank. You could put them in a 55 gallon tank but they would be extremely stressed out.
No matter what its dimensions are it is way too small to keep most fish in successfully.
After filling the tank and conditioning the water I like to give it a week or two till I stock it. Really it depends on the size of the tank, a 30 gallon can cycle in three to four days were a 75 gallon tank should be left to cycle for about two weeks
1.5 Gallon? That is a small tank even for a betta and two neon tetras. A typical rule of thumb is 1 inch of fish per gallon of water, so you should only have 1.5 inch of fish. A betta is 2 inches or more, so the neons would be asking for trouble. Both type of fish are great, so my advice would be to get a bigger tank and put them together. Neons are schooling fish and would like to be in groups of three or more.
depends on the size of the fish, the filtration, if it is salt or fresh... lots of variables. A very rough estimate has always been 1 inch of fish per gallon of water.
No. A betta requires water between 80 and 86 degrees, while goldfish require water between 72 and 78. Also, there is not enough room for these fish in that tank. 2 goldfish should have a 20 gallon tank minimum to themselves.
No. The tank is not large enough to house two female bettas. The basic fish keeping rule is "1 inch of fish needs 1 Gallon of water". A female Betta grows to around 1.5 inches so you would need at least a 3 gallon tank to house the 2 Bettas properly.