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Old 04-17-2006, 12:45 PM   #11
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My wife and I had the same exact problem. We tried everything that we could to try and get rid of the green hair algae covering our entire tank. We bought every type of clean up crew that we could but nothing would work. What we figured out what was wrong was that we had our tank lights on for way too long. I dont know what your schedule for your lights are but we reduced ours to 9 hours for the actinics and 7 hours for the day light. That helped tremendously where as we no longer have any hair algae. We also took out the algea by hand every day until it was gone. Hope this helps.
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Old 04-17-2006, 03:13 PM   #12
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Yup.

Less lights on time.

Phosban reactor or PO4 remover in filter if you have one.

Less food goign into the tank.

A fe more Turbo Snails (Try different types).


All that along with some manual removal should help clear up your issue.
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Old 04-17-2006, 04:28 PM   #13
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Quote:
Originally Posted by luckycat
what amazes me is that the mere 0.05 mg/L is enough for this algae to thrive like that.
The problem with po4 tests on the tank is it only shows you the results after its been consumed by the algae which is why it’s much lower then someone with the same amount and no algae would test at.

Quote:
Originally Posted by luckycat
My source RO/DI water is also 0.05 mg/L btw.
With ro/di your replacement water should have no trace of po4. What is your tap water po4 level? What kits are you using to test for po4 and have you tried more then one or will your lfs test for po4? How many months has it been since you replaced your PC lights and do you replace them all at one time?

The other main po4 source is food and limiting your feedings will help along with manual removal and reduced lighting.

Flow seems a bit light for a 90 gal. I’ve never heard of a Maxi-Jet 700, does it do about 100 gph? The Mag 18 gph which if having to push one story up 96+” along with tank stand/height of about another 55+” has a head height closer to 13 feet or 660 gph.

Total would be around 900 gph or about a ten times turn over which is on the low end for a tank that size. That’s assuming you do not have any 90 degree angles for the return which also limit head height by 1 foot each time. You could have as little as 300-400 gph coming from the Mag 18.
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Old 04-18-2006, 08:57 AM   #14
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Quote:
Originally Posted by tecwzrd
Quote:
Originally Posted by luckycat
what amazes me is that the mere 0.05 mg/L is enough for this algae to thrive like that.
The problem with po4 tests on the tank is it only shows you the results after its been consumed by the algae which is why it’s much lower then someone with the same amount and no algae would test at.

Quote:
Originally Posted by luckycat
My source RO/DI water is also 0.05 mg/L btw.
With ro/di your replacement water should have no trace of po4. What is your tap water po4 level? What kits are you using to test for po4 and have you tried more then one or will your lfs test for po4? How many months has it been since you replaced your PC lights and do you replace them all at one time?

The other main po4 source is food and limiting your feedings will help along with manual removal and reduced lighting.

Flow seems a bit light for a 90 gal. I’ve never heard of a Maxi-Jet 700, does it do about 100 gph? The Mag 18 gph which if having to push one story up 96+” along with tank stand/height of about another 55+” has a head height closer to 13 feet or 660 gph.

Total would be around 900 gph or about a ten times turn over which is on the low end for a tank that size. That’s assuming you do not have any 90 degree angles for the return which also limit head height by 1 foot each time. You could have as little as 300-400 gph coming from the Mag 18.
Thanks everyone for your replies. As far as photoperiod - there are 4 lights in the T5 (54w each bulb), two pairs of aquablue and blueplus. They first pair goes on at around 8 am and off at 7 pm, second pair on at 10 am and off at 4 pm...it was like that... Previously I had blueplus & daylight pairs, but at the advice of someone else swapped the daylight for aquablues. I'll try smaller photoperiod.

The maxijets are 600s (160gph ea), as far as the basement feed it is off the floor about 4 ft, rise is around 9 ft w/2 90s (I'll be replacing those with flex pvc soon), based on the headloss calculator on another site I think it is around 800-900 gph.

I'll try taking my water to the lfs for po4 testing.... i do have a calibration kit in the kit and it seems to work fine - but all of the water I test (RO/DI direct, tap water, salt water resevoir for water changes and the tank itself are 0.05 mg/L).
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Old 05-29-2006, 04:22 PM   #15
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Honestly it may sound strange and I may get bashed for this but I used to let the algea keep growing!. I would farm off the crazy amounts like you do but I find that if you let it go for awhile after some time you will notice that it will start to lift off the rocks like a carpet and the rock will be totally crusted in purple coralline... I have done this on 2 of my reefs and once the whole thing is solid coralline (my tank looked like I had painted the base rock purple!)

It does take a few months (2-3 I think it was)...In the meantime the tangs an other herbivores are happy.. and after all this is how it goes in the ocean...


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Old 05-30-2006, 11:00 AM   #16
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I have two urchins that much everything on my LR. I am thinking about getting another one with my clean up crew. It seems they eat all day and all night. IME they are healthy grazers.
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Old 05-31-2006, 04:37 AM   #17
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Do your urchins eat away at the coralline and leave trenching on your rocks?? Some I have seen will...
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