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- 1). Measure the width, height and depth of your fish tank using a tape measure.
- 2). Visit a hardware store in your area and purchase an LED flashlight that is capable of lighting the whole area of your fish tank. As of 2011, cost for these start at around $9.99. Buy a waterproof transparent container as well. The transparent container should be big enough to enclose the LED flashlight. This will cost you around $7.95, or more, depending on the size of the container. The container should be big enough to fit the LED light.
- 3). Take the closed, waterproof, transparent container and submerge it in the water. Leave it for a couple of minutes, then check to make sure that no water enters it.
- 4). Put the LED flashlight in the container and turn it on. It should emit bright light that is capable of lighting the whole area of your fish tank. Close the container tightly so that water will not get inside.
- 5). Get a cord or a fishing line and attach it to the waterproof, transparent container. You can tie the fishing line or the cord on the clip or handle that is included with the container. This will allow you to remove it from the water easily.
- 6). Submerge the light in the fish tank.
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