The glass is hosting the least amount of your pod population. A great big flat surface with nowhere to hide in plain view of all the critters that like to eat you is pretty much a failure for the theory of survival of the fittest.
All the nooks and crannies in your rocks, the underside of the rocks, in the dark, under corals, that's where the pods flourish.
If you are seeing a decent quantity on your glass it's nothing in comparison to the population within your tank.
I have to wipe the display panels of my 750g every 48 hours. But the pod population when I pull a rock or a dead frag on the underside is huge, And that's with 150 fish, 3 pipefish, 2 Mandarins, 6 wrasses... etc etc
Dave B