Food for snails?

[Thumbster]

I never thought that I would have to ask this question, but I feel like my tank is now too clean and I'm wondering if there is an algae pellet or something to feed my snails? I've tried nori sheets, but my fox face eats it long before the snails have a chance.
I have trochus, astrea and a couple cerith snails.

 

[Mr. Mojo Rising]

Don’t clean your glass for a few days. But Biofilm also grows on the rocks and sand which we can’t see. I wouldn’t worry about it

 

[me & my baby]

You can also use algae wafers