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Old 02-16-2010, 09:46 PM   #1
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Help - Green Algae and Metal Halides

Been learning a lot here over the past 18 months but now I have a problem. I recently upgraded from 210W of PC lighting to 2 - 250W metal halides and T5 - Actinics. I 'was' leaving the MHs on about 5 hours a day and the Actinics about 8 hours. Within a few days - I got a ton of green algae growth on all my rocks. I have gone to the local fish stores and they have offered up the following...

Feeding the fish too much - I now cut back to every 3rd day.
Too much phosphate - I need to get my water tested
MHs not 'burned in' yet...

Their advice is to just wait it out - let the fish and urchins eat the algae and things will eventually clean up. Just wondering if I am missing something.

At this point - I only have the MHs on for about 4 hours a day and the actinics are not on at all. The tank is not near a window and this only started after I put in the MHs.

Any advice?? All the fish are doing fine... Just a lot of green algae

75 Gallon Tank - 5 Gallon Sump - Trickle Filter and 2028 Eheim Canister

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Old 02-17-2010, 08:31 AM   #2
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Welcome to AA!
Lots of green algae = lots of excess nutrients.
You need to test for phosphate and run GFO (granular ferric oxide) in a reactor to drop the phoshpate levels in your system.
What is your nitrate level?
Do you use RO/DI water for top offs and water changes?

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Old 02-17-2010, 08:41 AM   #3
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I too would be very interested in your phosphate and nitrate levels.

Also, what do you feed?

"Life may not be the party we hoped for but while we are here we might as well dance!"

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algae, green algae, metal

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