The Wall Street Journal's Ali McConnon takes a dive into the world of ultra-luxury aquariums, where underwater design elements are considered "interactive pieces of art."

Such custom aquariums can come in all shapes and sizes--from your garden-variety rectangle to three-story cylindars--and the more unusual, the higher the price:

They can start at about $5,000 for a 10-gallon tank and reach $1 million or more for a 5,000-gallon one or larger that has rare fish. And that doesn’t include maintenance, which typically is done weekly and costs 50 cents to $1 a gallon every month.

When deciding on an “aquascape” for their tank, some people want to showcase the fish from a favorite snorkeling or scuba-diving trip. Others choose rocks, plants and crystals to create a small-scale representation of a mountain landscape, rainforest or even a rice paddy.

McConnon rounds up a collection of stunning examples, from underwater gardens that fetch $40,000 to a fireplace/aquarium combination that runs $150,000. It's a feast for the eyes, check it out:

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