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It would depend on the size of the tank, and what comes with it.
between $7 and $50
A betta fish would be much more suited to a 1 gallon tank than a 'variety'. You shouldn't keep much more than one fish per gallon anyway.
the fish tank
Fish Tank grossed $5,922,292 worldwide.
It depends on how much water and how pressure is on the tank.
fish tank
It depends on the species of fish. 15 Guppies would need a much smaller tank than 15 Oscars would. A good general rule is for every inch of fish you have a gallon(4 liters) of water keeping in mind that your fish will grow.
Fish Tank grossed $374,675 in the domestic market.
Scoop all your fishes to another tank or tub of water and clean the fish tank just as you would normally without the fish
A fish tank would be considered an ecosyestem because there is a living thing in it. (the fish)
Yes but you would have to clean/scrub the tank out properly first.