A skimmer is the long term fix. Other methods of removal are just laying a
paper towel across the top of the water and then pulling it out. Increasing
surface disturbance will help sorta, what i have seen is that is actually
will create a area where it's clear but the film will "pile up" in other
areas of the tank.

I have read that it is a mixture of sugar and protein. A by product of the
plants natural processes. Harmless really. Just sorta unsightly.


-Yukaputz


"LeighMo" wrote in message
...
Anyway problem is I have a strange white oily film on the water surface,
the
origin of which is baffling me

It's very common. I've heard it's caused by a bacteria. I've also see
green
surface films, which are algae.

If you can, try increasing your surface turbulence. That will break up
the
film so your filter can take care of it.

Also, make sure your nutrients are in balance. Sounds like you have
plenty of
nitrate, but what about phosphate, potassium, traces, etc.?



Leigh

http://www.fortunecity.com/lavender/halloween/881/