Originally Posted by xxabc
Alright then, I'll see what I can do about that. However, when I did have absolutely 0% surface disturbance, there was this gross oily stuff across the water. Byron, do you ever get this? What could I do with removing it and keeping it away?
(Sorry for stealing from OP!)
That is a protein scum, and yes, I have it, more in one tank than the other two. I used to use surface skimmers on my canister filters, they pulled it off without causing disturbance to the water surface, but unfortunately fish kept getting sucked in, and as I have so many small fish, not to mention regular spawning in all tanks, I took them off rather than fiddling around with screens.
Now I just use the Python during the weekly water change inverted from underwater to pull most of this off. A bit of effort, but not too much. It is not really a problem, but built up it does reduce the exchange of gas, or so I have been led to believe.
In my Amazonian setups i seldom have this, probably because the filters do create ever so little surface movement. In the SE Asian tank, where it is the worst and quite thick, the floating plants prevent gentle surface water movement. But as I have spawning Chocolate Gourami and Pygmy Sparkling Gourami in there, the plants are staying put.