Depends on whether or not you have aeration (an air pump). If no aeration, then you shouldn't put more than 2-3 fish "inches" (total inches of fish) in the aquarium. If you do have aeration going, then you can double this amount and have up to 6 inches of fish.
You can fit a 5 gallon fish tank on a school going desk.
one
one
Two gallons
This is simply funny if it really means a fish tank.About 1025.5 for a standard 100 gallon fish tank if the beers are 12 fl oz.Remember fish tank gallon sizes are measured by outside dimensions.
The basic rule of thumb is "not more than an inch of fish to a gallon of water."
Depends which tank.
You can fit one betta in a 1 gallon tank, but nothing else.
depending on whether you plan to keep them till adult hood a 50 g tank will hold 4 adult angels
in the worlds smallest tank you can fit 5 fish in it, so atleast that
4,000
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.