The beautiful Guppy is one of the most low maintenance tropical fish out there - and will happily live in a small aquarium ...

A dinky, single-gallon bowl is much too small, and even the 10-gallon tank you see in every pet store won't cut it. A single adult goldfish needs at least twice that much water to thrive.

But in pet stores, these popular pet fish, known for their striking colours and flamboyant fins and tails, are often kept in small tanks or even plastic bags, leaving them with insufficient space ...