Do you intentionally let your glass dirty up a bit? I like to let my glass go a couple extra days to dirty up so my snails get to snack. I also find that when I scrape it my omnivore fish follow me around for tank snacks too.
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True, mine mainly feed the back wall too but I notice at night when my glass is dirty it's one big party with all my inverts out big and small, snails, asterina, linkia star,etc...I clean it every 3 days and have gyres aimed at glass for reduced adhesion of film algae. My snails feed off the back wall of tank IF tangs which are many leave any algae