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Old 11-07-2006, 03:19 PM   #1
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Algae plague

Inexplicable algae: 8 month-old 500-litre tank, sump and protein skimmer. Water is crystal-clear. I've just measured Ph 8.0 (I've added a bit of buffer to get back to 8.2), NO2 0.05, No3 0, NH4 0, PO4 0, Ca 320ppm.

Fish are lively and in perfect health, I feed them a varied diet every other day and the protoreaster gets a mussel once a week.

The skimmer bubbles out about 50cc (a small coffeee cup) of black water a day.

BUT over the last 2 months I'm getting ever-increasing algae (green, brown and cyano on the sand). I've siphoned, stirred, prayed, to no avail.

Any ideas/suggestions would be most appreciated.

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Old 11-07-2006, 10:21 PM   #2
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How's the circulation? Dead spots? And how long are your lights on. 10 hrs a day works for me.


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Old 11-08-2006, 06:57 AM   #3
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here is another how old are the bulbs , frequency of feeding , what are you feeding .
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Old 11-08-2006, 08:45 AM   #4
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I agree with the rest, I would probably look into getting new bulbs. Once they start fading, some around 6 months, the spectrum of light changes, allowing that nasty stuff to flourish. Make sure you have good water flow, and are not feeding more than they can eat in about 3 minutes. Remember flakes are great phosphate feeders, frozen can be as well, just rinse the frozen and drain. I tend to think, the lights might be the culprit, since this is the first bloom you have had in 8 months....
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Old 11-09-2006, 12:37 PM   #5
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Silly me, of course, the lights *smacks forehead on desk*

Thanks for the hint guys !

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Old 11-11-2006, 04:50 PM   #6
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Also what type of water are you using ? Tap,RO/DI or distilled.



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