Look for the Philips marathon "Daylight". The K rating is really small on the back of the package. It's either 5600K or 6500K. I forget right now, but "Daylight" is what you want for cheato. Fast growing cheato means it's pulling more nutrients out of your water. But it is also an inticator of nutrient load in your system. If you have a small bioload, Skim heavy & don't feed much, you won't likely grow cheato overly fast. Use your test results not the growth rate of cheato to detrmine if it's working. If you test low or better yet, undetectable levels of nitrate & phosphate, your cheato is doing it's job. Also, try lighting it 24/7. Then it's working all the time and will help stablize you ph at night.
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