i have a small 20g tank that im running in addition to a larger tank. the 20g is running on a canister filter, and the PH doesnt stay steady, and it has affected some of my zoas and mushrooms (partially closing/shrinking). ive attributed it to lower oxygen in the room, and since its winter, its hard to keep a window open. my question is, will a HOB skimmer help?im not sure if they have an ability to run an airline outside, but im hoping someone here has personal experience with one that might help out.

