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Discussion Starter · #1 ·
I try to understand better (if it is possible at all) what prevents or inhibits algae growth in well planted high tech tanks. One question keeps bothering me.

Is there a basic difference in tolerance of high oxygen levels between vascular water plants and most algae?

When we look in a well planted and fertilized tank with high light we see the many bubbles coming out of the vascular plants, i.e. they are capable of releasing oxygen as gas even at almost complete oxygen saturation in the water. I guess that most algae cannot do this, since they do not have gaseous oxygen. Otherwise they would all float on top of the water. If they cannot do this, they obviously have to release dissolved oxygen against the high saturation levels in the water. It may also lead to higher internal oxygen levels compared to vascular plants which negatively affects their Rubisco activity. May this be a reason why such tanks suffer less from algae problems or do I miss something here? :confused:
 

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Discussion Starter · #3 ·
Kasselmann, a German water plant specialist, refers in her book (1995) to 70 - 130% oxygen saturation in well planted dutch tanks. This is the only source I found. I read other threads that mention pearling at lower concentrations especially with low water movement leading to locally high concentrations over the leaves. But I do not know how much water movement is required to overcome this. Maybe there are other studies that report lower values? I would still be interested whether algae can generally cope less well with higher oxygen levels. I did not find much about it. But maybe it is not important as you mentioned. This would just add to my way higher count of being wrong ;)
 

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Discussion Starter · #5 ·
Yes, I heard about the importance of algae. I think they are sometimes responsible for "dead zones" (oxygen-free areas) in the ocean and lakes when dead algae are processed. So, I guess it would play a large role in tanks if you have much material that bacteria feed on.
 
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