I wouldn't actually mind if it only covered the back glass... but it never works out like that lol, always gets onto the rocks. Livelymc, if its a FOWL and your fine with how it looks, don't worry about it, it wont harm your fish. If it gets out of control, carefully remove some. The trick with algae reduction is to reduce nutrient levels in the tank, this means either more frequent water changes, stopping over feeding (if you are over feeding), and by cleaning any mechanical filtration regularily.
If you want to reduce the ammounts without "nuking" the tank, then I would recomend setting up or buying an algae scrubber (from the 1 or 2 guys that sell them), once this is running full tilt, you can start scraping the algae out of the tank, any that stays behind or dies in the process can fuel further growth... but this growth is limited by the imput and output of nutrients. So with the scrubber running full tilt, the algae growing on the scrubber (which is a good thing) will compete with the bubble algae for nutreints, therefor slowing the growth of both, but if you keep removing bubble algae there will come a point where the algae scrubber "wins" and takes close to all of the nutrients out of the system, therefore almost completely stopping the growth of algae in the display.
If you want to reduce the ammounts without "nuking" the tank, then I would recomend setting up or buying an algae scrubber (from the 1 or 2 guys that sell them), once this is running full tilt, you can start scraping the algae out of the tank, any that stays behind or dies in the process can fuel further growth... but this growth is limited by the imput and output of nutrients. So with the scrubber running full tilt, the algae growing on the scrubber (which is a good thing) will compete with the bubble algae for nutreints, therefor slowing the growth of both, but if you keep removing bubble algae there will come a point where the algae scrubber "wins" and takes close to all of the nutrients out of the system, therefore almost completely stopping the growth of algae in the display.