Bright green and hard to scrub

[sc166]

I have this bright green-what I'll assume is a type of algae- growing on the the glass. My algae eat does not eat it (which is why I'm confused) and when I tried to wipe it off with a rag, it was really hard to get rid off. I really had to scrub at it. It does not grow/ multiply very quickly.
Not the best picture but at least it gives an idea.

Any suggestions on what it is?


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[Caliban07]

Looks like green spot algae. Probably caused by prolonged lighting duration and/or intensity. If you scrub it it will just come back.

What size tank is it? What type of lighting and how long are the lights on for?

You can add a siesta period that is supposed to benefit live plants and slow algae growth. 8am-1pm on 1pm-5pm off and 5pm-9pm on seems to be a good start with a total duration of 8 hours.

Do you have live plants?


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[ImACoolguy]

+1 to Caliban.

It's GSA and isn't uncommon in planted tanks.

Most "algae eaters" don't even make a noticeable difference.


Caleb

 

[sc166]

It's a 29 gallon tank, there are a 3 real plants but they're small, LED lighting and they're on between 10 and 15 hours a day (turn on when I wake up turned off when I go to bed)


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[ImACoolguy]

It's a 29 gallon tank, there are a 3 real plants but they're small, LED lighting and they're on between 10 and 15 hours a day (turn on when I wake up turned off when I go to bed)


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That's why. Past 8 hours daily you will see algae growth.


Caleb

 

[Fishperson]

Yeah, get a cheap timer and set it for 8 hours or so.

What kind of LED lights? LED lighting is all over the place; the most powerful lights are LED but the least powerful are as well.

If it's a stock lighting then dropping the duration will help.

 

[schpanky]

I always just use a scrub brush about once every two weeks. That's better than a rag. Luckly it's really slow growing.