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Utterly beguiling and deeply enchanting, the instant aquarium DVD has been a hit in the gadgetshop HQ lab ever since The Open University went off daytime TV and into the middle of the night. Now, instead of the crackle of polyester sweaters and the screech of algebra being formed on a blackboard, we simply turn on the DVD and let it play.

There's no tank or assorted underwater gubbins in the shot - just the beauty of tropical fish doing a tropical fish samba. Unlike the other Aquarium DVDs we've tested, there's a purity about this version that puts one (not to mention one's cat) right there. There's no sound, other than the feint hum of the air pump. No music, other than the music in your head.

In fact, close your eyes and you could be on the Great Barrier Reef, minus the killer jellyfish. And, because it's on a loop, there's no need to start it all over afresh at the end of 70 minutes. It just keeps playing and playing and...

... your only risk in buying this disc is that you might find yourself nodding off. But look at the positives: total relaxation, no mess, no fuss, no dead fishies, no bad smells, no tank maintenance - and no little Nemos trying to make their way back home.

Totally tropical.