Brown Algae/Diatoms - weird "straight line cutoff" on ends of tank

1611mac

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OK.. I've ton's of posts about brown algae/diatoms and I'm not asking how to get rid of it...

But I am curious...
On both ends of my 55 gallon tank (I clean front more often) the algae goes up about 3/4 of the way and then just stops... It'd a straight line across. Almost as if I had scraped a straight horizontal line and everything above that.

How/why can algae start and stop at a pretty much at a straight horizontal line? Weird!

comments?
 

TexasDomer

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I have the same along the back of my tank. I'm assuming it has to do with the way the light hits the back and sides of the tank.
 
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1611mac

1611mac

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Seems to not match with any water change scheme... Might be light related... will investigate further.
 

BDpups

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I have a tank with brown algae on the back of it from top to bottom. In the middle there is a section that is completely algae free. Its the weirdest thing.

It also shows up on quite a few of my tanks right above the substrate.
 
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1611mac

1611mac

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I have snail "tracks" all thru my br. algae. Actually, they are not tracks, it's where the snail swiveled back and forth.


Now I'm going to clean the tank before you all yell at me. (It's actually not as bad as pic may indicate)
 

BDpups

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I don't mind it on the back. And in this one tank I have, I don't have any algae eaters. Its full of large South American cichlids. The tank is 22 inches tall and the clean stripe along the back is at least 6 inches and runs the length of the tank. I have never figured this one out.
 

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