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Old 12-19-2005, 11:04 PM   #1
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Algae Hypothesis...

I have this problem with algae in my tank, mainly a green algae that grows on the rocks and a green/brown slimy sheet algae that grows on the glass. I have been using RO/DI water for around 8 months now and the algae is still there. My tank always has higher nitrate levels also(don't know an exact number off the top of my head but I know its on the upper end). I feed my fish formula frozen cubes for dwarf angels usually by just breaking them in two and putting them in the water every other day...I was reading some posts about liquid that is in the frozen food that can cause high phosphates.

My three questions are, do you think my feeding habits could be contributing to some of the algae growth?
and..
Are the high nitrates a result of the algae growth?(my nitrite and ammonia are zero)

Any ideas on what I can change or adjust to lower the amount of algae?
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Old 12-20-2005, 01:18 PM   #2
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The frozen foods supposedly contain a lot of phosphates. I usually thaw a cube in RO water, then rinse it in RO water. To get rid of the last few stubborn phosphates, I use phosguard. That is pretty much taking care of the hair algae.

From what I understand, any phosphate is too much and will cause algae problems.
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Old 12-20-2005, 01:28 PM   #3
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I would try a different type of food. preferably frozen and see if you notice a change.
Quote:
Are the high nitrates a result of the algae growth?
Just the opposite. Algae growth is a result of the high nitrates. Have you checked your phosphate level?
Quote:
Any ideas on what I can change or adjust to lower the amount of algae?
Type of food and how much you feed. Run some type of nutrient removal media in you filter like poly filters, PURA filters, phosguard etc. Also regular WC will lower the nutrient level. In the 8 months you have been using RO have you checked water or replaced filters? Something is feeding the algae, once you remove the source it will disappear.
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Old 12-20-2005, 06:30 PM   #4
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Totally agree Stop the source. Do you have a skimmer. This will help take DOC out of the water that end up as the fuel source
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Old 12-20-2005, 08:58 PM   #5
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Here's some readings I got tonight, I don't have a phosphate test kit, which I realize would be applicable here but that will have to wait till I get to the fish store.
ph: 8.1
alk: 2.5 Meq/L
ammonia: 0 mg/L
nitrite: 0 mg/L
nitrate: 80 mg/L

To me it seems like all my levels are close to normal with the exception that I knew, nitrate. Would food and junk stuck in a filter pad cause the nitrate levels to rise?
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Old 12-20-2005, 09:01 PM   #6
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Would food and junk stuck in a filter pad cause the nitrate levels to rise?
Yes
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Old 12-20-2005, 10:33 PM   #7
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old lights may contribute also.
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Old 12-20-2005, 10:40 PM   #8
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How often and how big are your water changes. 80 is extremely high...
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Old 12-21-2005, 09:49 AM   #9
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I usually do 5 gallons which is ~7% every 2 weeks is that too small? Should I up it to 10?
I'll admit I've been slacking off cleaning the canister filter and theres probably alot of gunk stuck in the filter pads, this weekend I'm going to put fresh filter media in and clean the hoses out. I've been doing 5 gallon water changes this week like every other day so come this saturday I would have changed out 15-20 gallons of water, we'll see if that makes any difference.

If i understand this correctly, although nitrate isn't immediately harmful to the fish like ammonia and nitrite, it can have an effect long term? correct?
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Old 12-21-2005, 07:25 PM   #10
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I would definitely do more
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