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AUAV8R 02-06-2013 05:11 PM

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My tank has been up for 6 months and I've tried reducing light, increasing light and I can not get rid of this algae. I think it's diatoms but it doesn't come off of the leaves easily like I've heard. I'm not really sure what this is and any help would be greatly appreciated.

AUAV8R 02-06-2013 05:12 PM

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More pics

AUAV8R 02-06-2013 05:15 PM

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AUAV8R 02-06-2013 05:16 PM

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msawdey 02-06-2013 05:20 PM

looks like diatoms or brown algae to me.

Best fix... Otos hands down. Also if your bulbs are old then that may also be the issue. in the words of Tom Barr. "if you grow the plants, you wont have an algae problem"

I try to follow this. If i focus on growing the plants, ie providing enough co2, ferts, proper light cycle, then algae will disappear

AUAV8R 02-06-2013 05:26 PM

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Will doing a blackout help with this?

Peccator 02-06-2013 06:45 PM

A blackout won't help, this kind of algae thrives in lower light.

msawdey 02-06-2013 10:21 PM

How long are your lights on for currently. How old are the bulbs? Are you dosing ferts? Co2? Any algae eating fauna currently? RO/DI or tap for water changes?

AUAV8R 02-07-2013 01:35 AM

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Lights are on for 7 hours, bulbs are 6 months old, no CO2, osmocote plus root tabs, 2 ottos and 1 Siamese algae eater, tap water, standard 75 gallon using two 48" T5HO bulbs 8 inches above the surface.

msawdey 02-07-2013 01:56 AM

hmmm.. I truly think this is a no co2 issue. Try dosing with excel if you dont want to dive into the world of CO2, but I can tell you from experience, CO2 is the best algae control

zackariah 02-07-2013 03:47 AM

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I've got the same problem. What is excel.

msawdey 02-07-2013 03:48 AM

excel is glutaraldehyde... Think of it as CO2 in liquid form.... but nothing beats a full co2 system

AUAV8R 02-07-2013 08:14 PM

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I have paintball CO2, I just got tired of having to refill every two weeks. I bought an electronic solenoid to be able to turn it off at night but i didnt realize that i had to have a way to regulate the 800psi from the tank, down to whatever the solenoid requires.

DarKfish 02-08-2013 06:35 AM

For diatoms, you can make use of Siamese algae eater and RO water change.
Another fact that you must take into account is the presence of GSA (Green sport algae) that emerges in low phosphate condition. you can add some K2Po4 (potassium phosphate)

WestHaven 02-10-2013 10:05 PM


Originally Posted by msawdey (Post 2463922)
How long are your lights on for currently. How old are the bulbs? Are you dosing ferts? Co2? Any algae eating fauna currently? RO/DI or tap for water changes?

I'm glad I found this thread, because I just started having the same problem. My lights are 2x24 watter T5s, on for 12 hours a day, the bulbs are about 8 months old, I dose a capful of Excel every 3 days, and no algae-eating fauna. I use tap water for water changes. I did a 20% change today. What should I do?

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