Strange Algae Growth Pattern

gunk

Subscriber
Nov 14, 2009
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My aquarium is 2ft high, but algae does not grow past 1ft (from the bottom of the aquarium to half-way up). If I let it go for a while it actually forms a very sharp line right around the aquarium.

If it grew from the top of the aquarium down I would think may be it's something to do with the light levels but there should be less light at the bottom not more. I have considered that maybe it's temperature related but the flow in my tank should be enough to keep it reasonably even throughout the tank.

Any ideas why the algae would be growing like this?
 

aquabillpers

Lifetime Charter Member
Lifetime Member
Jan 24, 2005
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It sounds like the bottom part of the aquarium is getting sunlight for part of the day.

That happens to me in the spring and fall when the sun rises and falls in the sky.

Bill
 

Biollante

Lifetime Charter Member
Lifetime Member
Jun 21, 2009
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Surprise, AZ
Information Please

Hi All,

This is one of those times a picture would be nice. :)

Circulation can cause that kind of thing water can be (is naturally) laminar.

If you use CO2 and mist, it can be CO2 is not good in the bottom half.

An area of poor circulation, while this tank gets some sun, the reason for the algae outbreak seems to be dissolved organic compounds in an area of poor flow. I used ¼ teaspoon Alum in 80ml distilled water, no reaction until the solution reached the bottom third of the tank.

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Three water changes two days apart some cleaning, a good Fleet Enema wipe down an adjustment to a small pump and Bob’s your Uncle, no more nasties.

Biollante

P4120101..JPG
 

gunk

Subscriber
Nov 14, 2009
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I think your on to something with the poor circulation. I'm not sure what Alum is (but I'm guessing it's the active ingredient in flocculant solutions) but I added some Seachem Clarity and it clouded up straight away however the moment it hit the area where the algae starts, it took a turn and got sucked through a whole in my drift wood.

I've adjusted the flow direction a little and once I've made my new intake which incorporates a surface skimmer, I'll get rid of the two directional output (with one direction currently adjusted to give a little surface agitation) and replace it with a single one which should push the water a bit further down and around the tank sides.
 
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gunk

Subscriber
Nov 14, 2009
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It's been a while but I finally have an update!

I went out and bought a Tunze nanostream and directed it to give a better flow for the lower half of the tank and I got less GSA growing and what there was was spread more evenly around the tank. I then got a set of T5 lights (2 x 4ft) to replace the T8 ones and my plants went nuts and the GSA is almost completely gone. Unfortunately I also now have quite a bit of BBA.