Aquarium, pond or aquascape?
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Keeping fish and water plants can mean very different things. A tank of guppies in the living room, a koi pond in the garden and a carefully planted miniature landscape all share the same basics — clean water, the right fish, the right plants — but they ask different things of you.
The aquarium
An aquarium is a glass tank, filled to the top and seen from the side. Because it stands indoors, you control everything: temperature, light and water, so you can keep tropical fish from almost anywhere in the world. That control is also the work. Small volumes of water change quickly, so an aquarium needs a filter, usually a heater, and regular partial water changes.
Good for: colourful tropical fish, watching behaviour up close, breeding small species, and anyone without a garden. A guppy or neon tetra tank is a classic start.
The pond
A garden pond is seen from above, open to the sky and the weather. It follows the seasons: warm in summer, cold or frozen in winter, so its fish must be hardy — goldfish, native fish, or koi in a large, deep pond. A pond is a small ecosystem of its own: frogs, dragonflies, birds and insects arrive by themselves. A well-balanced pond with enough plants needs less day-to-day care than an aquarium, but the work comes in bigger pieces — building it, cleaning out leaves in autumn, and keeping it from freezing solid.
Good for: large, long-lived fish, wildlife, and people who want water as part of the garden.
The aquascape
An aquascape is an aquarium designed like a landscape, where the layout of plants, stones and wood matters as much as the fish. Styles include the nature aquarium, which recreates a scene from nature such as a hillside or forest in miniature, the Dutch style with dense, colourful rows of stem plants, and biotope tanks that copy one real place, fish and all. Aquascapes often use strong light, fertiliser and added carbon dioxide to keep the plants growing, and the fish are chosen to suit the scene: small schooling fish such as tetras and cherry barbs, plus shrimp and algae eaters like otocinclus.
Good for: people who enjoy design and gardening, and patient trimming.
And somewhere in between
You do not have to choose only one. A pondarium is open like a pond but stands indoors like an aquarium, and there are other in-between styles too — see paludariums, ripariums and other water gardens. If you are new to all of it, start with getting started with a real aquarium.