Only because for you to be supporting that number of snails in such a small tank I was thinking, what are they eating?
I was over feeding my tank to make sure my snails got fed. The only reason my tank remained algae free (it looked sterile) was probably because I had a tonne of Stomatella snails cleaning the rock and glass plus I had the chaeto pulling out the nutrient. Consequently, my chaeto grew really quick.
Thank you for you're reply here!
I do believe I follow your train of thought
Though with respect I think there may be a disconnect, friend

Snails like Nassarius and some others eat detritus including pretty much anything organic from left over fish food, to fish poo, to things that die in your tank.
But many other snails like Astrea, Cerith, and Nerite, for example, do eat algae. These are a pretty solid addition to a tank that has algae problems, in my humble opinion.
I believe you may be correctly realizing that if the CUC critters don't have enough to eat, they will indeed starve, which is a problem in and of itself. But I do believe that most would advise adding some algae eating inverts like snails given that the OP seems to have a tank full of algae for them to feed on.
Otherwise, I would't argue with your above reply, and I hope my reply back helps
