Skimmer for white/oily film on surface?
I recently started a 29g, it is now a little over 2 weeks old and contains the plants and a few snails. A couple of days ago it developed the white oily film on the surface. I skimmed it off with a net and drilled a small hole in the top of the return bar from my canister filter to ripple the surface. This seemed to work but overnight it comes back and the 'ripple' is unable to fix it without being skimmed again with the net. I have read about skimmer attachments for canister filters and wonder if I should invest in one? Or, is this something that the tank will work through? I have not ran into this particular problem before and value everybodys advice.