Sorry, friend, but I do not see any new revelations here: that had been said over and over again but people still look for a quick fix.
Science............supports the so called contradictions.And it contradicts everything you guys say about black out etc.
First we need to understand that algae can not be starved to death. The theory about nutrient competition between algae and plants is false. Even if we get demineralized water, water with no nutrients, algae will still grow in it.
Another theory is that CO2 kills algae. Well, it doesn’t. I placed algae in small amount of water in a sealed jar with only CO2 and waited, and waited. The algae never died.
Another theory is blackouts, covering aquarium with blankets for few days. Then we uncover the aquarium and see, it looks like it did something. Well, the blackout weakened the already fragile plants and did nothing to remove the cause of the algae infestation on the first place. So algae will certainly come back.
Another theory is high PO4 phosphate. Phosphate is usually associated with algae because it is found in high levels mostly in poorly maintained aquariums and therefore already infested with algae. There are algae free aquariums with high PO4, so PO4 does not cause algae either.
There is more theories...but ...
Let’s get to the question how to combat algae. We know it can be done because there are algae free aquariums. How is it done? It is done by providing the right conditions for the plants. When plants get what they need (see Plant Requirements), they suppress algae all the way to the point where algae melt, go dormant or die.
How do plants do it? There is clear evidence about plants releasing chemicals to negatively alter other plant species. Unfortunately not much research has been done for aquatic plants yet to prove it. Nevertheless, if we look at it from years of experience, plants suffer, die and melt in algae infested aquariums. On the other hand, algae suffer, die and melt in presence of healthy plants. So let’s put science aside and assume this is it… Then, suddenly we know how to steer planted aquarium to success.