I just had this little idea to have us all share some of our ideas, tips, tricks, etc for oxygen-related problems now that 1.1.8 features working oxygen sealers.
Post things like how you'd set up your leaves and sealers, how you manage to loop piping throughout your base while still giving it that "clean" look. (No/very few pipes)
As for me: I find myself putting my leaf-collection underneath my base, sometimes looping the oxygen right up to the sealers and others just snaking along the bottom side before popping in.