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I have used demineralised water from work at a very high purity of 0.02 microSiemens, which means that it is practically devoid of all nutrients. I put some in a glass jar, and left it on my window sill. It took a while, but I eventually got some Oedogonium growing in there.

Had I used the same water in a different jar on the same window sill, but loaded it with ferts, I would have undoubtedly seen far more rapid algae growth at an earlier stage. Now, had I placed two jars with the same contents in a dark cupboard, how much algae would I have seen to this day?

Water containing nutrients is a potential algae bloom, but without a triggering mechanism. Light is a major trigger for life. Add light to water and something is going to bloom. Light is the trigger.

It is important to make the distinction between what is actually causing your algae, as opposed to what is feeding it.

I run all my tanks under the EI regimen, which means excess ferts 24/7, yet I don`t get algae problems. If I switch the CO2 off, it is an algae infested mess of BBA, staghorn and Spirogyra. Poor CO2 is another trigger.

I believe the thought that excess algae dees not cause algae is starting to make some headway on TFF. Lots of us run tanks on excess ferts, so we prove to ourselves on a daily basis that it is not true. It is so easily proven that I cannot understand why the whole excess ferts thing hasn`t died and gone away.

Dave.
 
well spoken dave but wondering why high phosphate fertilzers and other organic runoff causes massive (esp. filamenous algae) blooms in so many natural settings. maybe just not enough co2? questions that kept me, and countless others employed for a long time. also lots of environmental spending to answer such simple questions. in closed systems i think we have more control over natural ones and all the complex variables that play a role in huge algae blooms.
cheers
 
i think everything has been said, but i am backing Dave & Fred. There is some links to algae threads on this guide here which make a good read:

http://www.fishforums.net/index.php?showtopic=298133

And trying to say excess nutrients cause algae is rubbish. Algae is never Nutrient or CO2 limited so try and limit them all you like, you wont win ;)

Limiting nutrients leads to unhealthy plants, unhealthy plants rot and leach ammonia, and ammonia causes algae.
 

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