Light change causing algae?
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Old 12-03-2013, 09:28 PM   #1
Z71kitty
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Light change causing algae?


I had a 36" thin, lightweight, cheap fixture running 2 x 29 watt T5 HO. I got a nicer one (Oydssey) with 2 x 39 watt T5 HO. They are on eight hours a day. After about a month, some of my plants started turning yellow and dying. I also started getting algae on the plants. I tried scraping it off but some of it remains. Is this because I changed the light? I am new to T5 lighting and don't know much about it.


Last edited by Z71kitty; 12-03-2013 at 10:03 PM.. Reason: misspell
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Old 12-03-2013, 10:31 PM   #2
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Are they plants getting enough food? Is new or old growth dying?
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Old 12-03-2013, 11:16 PM   #3
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I am feeding them flourish as directed on the bottle, the same as I always have. Nothing has changed except the light. Some new growth is turning yellow also.
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Old 12-03-2013, 11:23 PM   #4
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This is the algae on the anubias. Is it BBA?
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Old 12-03-2013, 11:30 PM   #5
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This is the yellow plants.
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Old 12-03-2013, 11:33 PM   #6
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Looks like BBA on the edges of the leaves, and it looks like you have some GSA on the leaves. BBA is a CO2 issue and the GSA could be too much light and/or you need to get your phosphates balanced. Anubias which are normally slow growers are prone to GSA especially in heavily lit areas of the tank. If you can move the anubia where it doesn't get as much light may help. I'm not sure about the yellowing of the other plants, but usually discolored leaves is a nutrient issue.
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Old 12-03-2013, 11:50 PM   #7
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I don't use C02 in any tanks except the fluval flora. I will check the phosphates and maybe take out one of the bulbs for a while. I forgot to mention that it's a 40 gallon breeder. I did have more floating plants but thinned them out. Maybe I introduced too much light at one time. I'll make some changes and give it a few weeks. I have been getting the same algae in my 20 gallon long and no changes have been made to the lights on that one. I also do more water changes and have only four fish in the 20 long. Two totally different tanks with same algae, not near any windows. Thanks for all info.
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Old 12-04-2013, 01:21 AM   #8
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phosphate 1.0, ph 7.6, high range ph 7.4, nitrate 0
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Old 12-04-2013, 02:24 AM   #9
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Give them some nitrogen... Macros to the rescue...
A co2 bump wouldn't hurt either, moat likely..
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Old 12-05-2013, 04:54 AM   #10
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If you increased light then you must increase ferts and co2 as well. You have an imbalance.

Yellowing could be micro deficiency; Iron.

Nitrates should be 10-20ppm.
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Old 12-09-2013, 07:30 AM   #11
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Giving them some ferts and reducing lighting hours. I will do more water changes also and reduce the amount of fish in the 40 gallon. One tank has very few fish, same old light and a heater. The other tank has a lot of fish, a new light and no heater. Both started getting algae around the same time. It's very strange.
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Old 12-09-2013, 04:47 PM   #12
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yes, more light, little to no CO2 will cause algae especially BBA. Looks like you have several other types of algae too.

More light isn't necessarily a good thing if your tank is suppose to be low tech.
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