Color Changing Jellyfish Aquarium Lamp

A clear cylinder on a black base that you fill with tap water and drop the soft artificial jellyfish into. LEDs under the tank light the water from below and cycle through eight colours — clear white, blue, pink, green, amber, deep blue, teal and red — so the whole column glows and washes colour across the wall behind it.

Straight answers

• It is not an aquarium. The jellyfish are soft ornaments. Nothing in it is alive and nothing needs feeding.
• Setting it up: lift the black lid off, fill with clean tap water to about 5 mm below the top, drop the jellyfish in with a few drops of cleaning solution, switch it on, and nudge them with a stick until they start to swing.
• Power: a DC socket in the base, or 3 AAA batteries. Batteries are not included, and the maker does not state which adapter ships with it — so treat the DC lead as unconfirmed.
• Switch: a rocker on the side of the base.
• Body: ABS base, clear tank, lift-off lid.
• Size: ships in a 23 × 15 × 8 cm box and weighs 311 g.

One colourway: black base.