The couscous that is sold in most Western supermarkets has been pre-steamed and dried; the package directions usually instruct to add 1.5 measures of boiling water or stock and butter to each measure of couscous and to cover tightly for 5 minutes.he couscous that is sold in most Western supermarkets has been pre-steamed and dried; the package directions usually instruct to add 1.5 measures of boiling water or stock and butter to each measure of couscous and to cover tightly for 5 minutes.
Votes: 466. It depends so much on the quality of the LED fixture you got with the tank. Some LEDs can grow plants, but many of them cannot. You can put a clamp lamp that takes a compact flourescent bulb over a small tank and grow a lot of plants pretty successfully that way. Not quite as attractive, but they do work quite well.
For an interactive learning experience, check out the Choose a Light Guide. 1  Light Bulb Purchasing Guide (PDF, 652 KB) 2  ENERGY STAR certified bulbs use less power (watts) than incandescent bulbs. 3  ENERGY STAR certified bulbs are available in a variety of shades. 4  Not all ENERGY STAR certified bulbs are dimmable.