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Old 01-08-2009, 02:07 PM   #1
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Lighting

Hi guys,

I have a 10g nano tank, and it has some tropical lighting above it (around 40w), and I was wondering if the fact that it's tropical lighting over a saltwater tank, could be causing me algae problems?

I feed sparingly, with good quality food, have low phosphates, use good water, only have the lights on for a few hours each day, clean out regularly etc., and have always had algae problems.

I'm hoping it could be the lights, then at least I can try that...
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Old 01-08-2009, 02:19 PM   #2
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The lights could be part of the problem. Depending on the spectrum. Anything lower then 10,000K is going to promote "plant" growth though with readings of phosphates in the water I would say that is your biggest source.

You may want to try some phosphate remover.

Can you post your actual water parameters from your tests? What source water are you using? RO/DI?
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Old 01-08-2009, 03:56 PM   #3
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Thanks for the reply...

These are the lights that I use; I have 3 of the 11w ones, 2 whites and then I've put a 9w actinic in the middle one: Arcadia - ARC-POD.

I'm running RowaPhos and have been for about 6 months, it didn't improve anything; as soon as I get the algae off it returns within about 3 days again (green hair algae all over the rocks is the main problem, not much on the glass).

When I say "low" phosphates they're classed as "barely on the scale" by my LFS...but it could be that the algae could be consuming them all, that's why they return a zero reading?

Water parameters: pH 8.2, amm 0, nit 0, nat <~3ppm, SG 1.024, temp ~27įC.

Just RO (not RO/DI).
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Old 01-08-2009, 04:01 PM   #4
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Yes I would say you are getting a false negative on your test readings. The fact that you have hair algae and occasional readings of phosphates means they are present and being consumed by the algae. Test your source water, your pure water and newly made SW and see what you get.
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Old 01-08-2009, 04:03 PM   #5
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Okay will do...I'll post the results here
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Old 01-08-2009, 04:09 PM   #6
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If you have the Tropical bulbs, I would say that is a large part of the problem. Just by looking at the color spectrum graph on their site, that bulb peaks in the red, orange and yellow spectrums. For a marine bulb, you want the spectrum to peak in the blue (low 400) range.
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Old 01-08-2009, 04:13 PM   #7
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ccCapt: that's good to know, because I really have tried everything over the past year. I wonder if I could get some "marine" replacement bulbs for it? The actinic one I got I had to get off eBay in the US (I'm in the UK!)...
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Old 01-08-2009, 04:24 PM   #8
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Can't help you there. You may be better off just buying a new small T5 fixture if you can't find bulbs.
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Old 01-08-2009, 04:27 PM   #9
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I'd be prepared to get a new light fixture if it had a good chance of solving my algae problem! My tank is 10G, and the light would be fairly close to the surface...what sort of wattage would you recommend, and should it be T5?
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Old 01-08-2009, 04:42 PM   #10
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I don't know the dimensions of your tank, so a T5 may not fit. But something like this would work.
Aquarium Tank Overhead White Blue T5 x3 lighting Lamp - eBay (item 220340981933 end time Jan-10-09 16:00:00 PST)

Actually, not sure if that would even work. It depends on what corals you have in there, if any. They are T5, but not HO.

These are HO, but I don't know if they will fit.
http://cgi.ebay.com/New-T5ho-t5-ho-2...3A2%7C294%3A50
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