02-20-2008, 06:39 PM
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What are your phosphate readings, what are your Nirtate readings, and finally, what type, and how old are the bulbs in your lighting. Also, test your tank for calcium and alkalinity.
as bulbs age, the spectrum of light they give off changes. The altered spectrum feeds the undesirable algaes. PC bulbs are good for only about a year.
any phosphates and nitrates will feed the undesirable algaes, however, Coraline algae also feeds on trace amounts of phosphates. Control of your phosphates and nitrates is better achieved via regular water changes, and natural nutrient export. Phosphate removers can actually hinder your coraline growth. Better bet would be to ensure that the top-off and water change water has no phosphates. If you have nitrates above 0, you should look into the type of macro you have (if any) in your sump. Macro algaes will help to consume the nitrates in the system.
Finally, youll want to keep your calcium levels in the tank up around 450. This will encourage coreline algae growth. The coreline algae will in turn feed off of the nutrients in the system and will starve out (or at least hinder its proliferation) the undesirable algaes.
one additional note, make sure youre not over feeding.