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Okay guys, using your valued advice I've moved the CO2 diffuser slightly so that the flow is not obstructed by the taller plants (Echinodorus 'Ozelot Green'). The spray bar (by trial and error) has been moved slightly higher to agitate the surface a bit more and have had to increase the CO2...

I've tested the GM and KH with the following results: GM 11dH and KH 14dH with PH 7.2. Testing my tap water gives me the same results. Puzzled :? about PH as I thought that would be a little lower given the CO2 injection. So, I've still not removed the surface scum with the remaining water...

Rudedog - Interesting thought regarding the hardness. CO2 is lime green and not sure I can increase any further. Flow now appears to be fine but scum reappears within two or three days of a water change. I'll test for GH/KH tonight.

As ever, thanks for the replies. Although using a skimmer initially appears to clear the problem I'd like to find the root cause. There must be some reason why it appeared. :? I'll increase CO2 as much as possible and look at the flow patterns again. I'll get back to with a progress report.

Hi, Once again I'm looking to UKaps members for advice...sorry! Forgive me I'm still learning about this great hobby. Problem: for some reason a film of green algae suddenly appeared last week on the top of the water; only obvious by looking up from beneath the surface. The remainder of the...