Really it should only be about 2 because they will get a decent size and u may even have to remove them eventually A ten gal tank is not big enough to even consider housing 1 parrot fish. (Try a clown fish with an anemone) Parrot fish are marine and grow to around 2-3 feet long. Before you start keeping marines you need to do heaps of homework and research. (You will also need a fair bit of cash to set up properly too). If on the other hand you mean the (Taiwanese created) abominations called the "Parrot Cichlid" then I would advise you to give them a miss. These man made fish have deformed mouths (amongst other things) and are problematic to feed/keep.
id say 15 fish
length and width for a 55 gallon fish tank
The rule of thumb is usually a gallon per fish, so six gallons would be good. If the fish are on the large side (like a goldfish), then a seven gallon tank would be ideal.
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.
Only 1. Usually a Betta is all that is kept in a 3 gallon tank
one
depends on the fishes size
one
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.
you can put a betta in a 5 gallon tank
Depends on the size of the fish, but no more than a total of 17 inches of fish. 1 inch of fish per gallon of water.
2 or 3