How expensive is it to keep a fish tank?
The price depends very much on the size of the aquarium and the technology. Fighting fish aquariums require almost no technology; it is even possible to operate the aquarium without a filter. Aquariums can also be operated fully automatically, with computers controlling the fertilisation and water values, topping up the water and controlling the light for sunrise and sunset. If you want to buy such a high-tech system, you will have to dig deep into your wallet.
But in aquarists, there is the possibility for every budget to acquire an underwater world and then enjoy the ornamental fish.
