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Old 12-07-2013, 09:45 PM   #1
Pi Guy
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Green Spot Algae


I've noticed some GSA on the glass of my aquarium. What causes it and what would be the best way to get rid of it?

Thanks.
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Old 12-08-2013, 02:20 PM   #2
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Low phosphate levels if i remember right, and too much light for too long per day...
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Old 12-09-2013, 02:17 AM   #3
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Thanks. I will look into that. What are the optimal phosphate levels?
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Old 12-09-2013, 02:27 AM   #4
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if you get direct sunlight or really bright light it will cause green spot. from personal issues with green spot is mostly light related. really bright light for long amounts of time will cause it. fastest way to get rid of it is scrubbing. nerite snails will eat it so do rams horn but not really well. more plants might help but i dont think that is much good
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Old 12-09-2013, 02:34 AM   #5
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Quote:
Originally Posted by Pi Guy View Post
What are the optimal phosphate levels?
Typically considered 1-2ppm. But it can be more if you have high nitrates, either due to heavy dosage, fish load, or feeding. And sometimes less if you have the opposite conditions.

If you rule out excessive light, which can cause GSA despite sufficient phosphates, GSA is a pretty good way to determine if you have enough phosphates; without having to test levels directly.
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