You don’t have to spend a fortune to populate an aquarium with a host of colourful finned friends. From garden ponds filled with Koi Carp to the humble goldfish bowl (although goldfish are far happier ...

Buying an aquarium can be an expensive business - but the inhabitants don’t have to be pricey. From garden ponds filled with Koi Carp to the humble goldfish bowl (although goldfish really need far ...