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the surface scum disappearing when you increased surface agitation is probably more due to the fact that the surface was more violent, so the wastes were forced back into the water, and therefore caught by the filter :) I doubt it had anything to do with more O2.
I didnt even have that in a high light, high tech tank. 3 wpg is extremely high lighting.
Diana is a member here, maybe if your reading Diana, you can give us your take on it all? :)
1. Natural methods are methods that dont use any filtration other than the plants themselves. It goes deeper than that but thats the crux of it.
low tech tanks are those without co2, generally low light as well with plants to match those conditions.
2. the El bit is saying it as if you were...
You need something over the compost yes, but Id use a gravel, not sand. Sand tends to seal in the compost, preventing water from circulating through it and resulting in a build up of undesirable substances like NH4, which then leech into the water column. Gravel lets the water through and the...
Im having BBA issues too Ed, and like you, Im at a loss.
The old accepted ideas that BBA was caused by CO2 cant be applied to me in this case, CO2 is bang on, lots of circulation etc. There has to be more to it.. one of my thoughts was that NH4 was leeching out of my aquatic compost substrate...
Diana is a member here too, so maybe shell have some input if you get any specific issues. I for one am really interested in the natural techniques but know almost nothing about it. Id be fascinated if you start a tank based on the methods.
If you do go for it, maybe youd like to run this...
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