In the corner of my aquarium I would like to put an "air" volcano, i.e. silicon rocks together in the shape of a volcano and put some kind of a plastic bag inside that fills with air and "erupts" when it is full. I am concerned about the glass behind this volcano. With the excess supply of oxygen, is this part of the aquarium going to be more prone to algae buildup? I am guessing that my snails and plecostomus will not like to hang out there.