Was not sure where to post this. Move if needed. My question is I have a planted tank that I get allot of that protein film on the top of my water. I was wonder does anyone run a protein skimmer at night to rid this problem? Or any ideas of how anyone has dealt with this. Or am I just being over paranoid about the exchange of gases. The tank is a 55gal tub. Heavily planted with C02 and a canister filter. Use a drop checker to maintain high C02 levels.