Why is there a film like layer of something on my surface.

[cichlidkeeper91]

Ever since I was doing my DIY co2 system. I got a wierd film kinda thing on my 12 gallon planted fish tanks surface. Do you people know what it is. How to get rid of it?

[Native American]

No clue what it is...usually, those films are just the natural oils present in fish foods. It may have just appeared at the same time you started your DIY CO2; i.e., a coincidence.

I use a Hagen surface skimmer tee'd into the inlet pipe of one of my canisters, and it works wonders.

v/r, N-A

[joelfish]

i don't know for sure, but here's a thought - the by product of the sugar and yeast reaction is CO2 and alcohol. Alcohol is lighter than water and will float on top.

I use 2C suger and 1/4 tsp. yeast and I only fill the 2L bottle about 3/4 full.

hth,
joelfish

[cichlidkeeper91]

Its actually going away now. Dont know what it was but it is.

[fresh_newby]

it is common in some DIY CO2 setups. Some get a protein skimmmer, and others move their outputs to the surface for more surface movement...