not sure about potatoes but I feed my snail: cucumber and zucchini.
Mine single nerite loves zucchini, and I recently found out that my inverts will power through the STEM faster than they do anything else. I grew organic zukes this year and froze slices of them for the inverts. We pull out a slice every several days and thaw it in hot water until it sinks (usually boil the water in the microwave for 30-60 seconds and the zuke sinks after several minutes). Once it goes in the tank the 3 shrimp and snail go after it. The last piece I put in was mostly stem. There was a LARGE chunk of it (I mean, large for 4 little inverts...probably the size of a gallon jug's lid) left after day 1. I expected to be removing what was left after day 2, but when I woke up that morning the huge chunk was completely gone. The last critter I saw on it was the snail. I was floored and went looking for it everywhere in the tank. Sure enough, they finished it.
ETA: I can't get any of mine to touch algae wafers. Maybe I bought a type they don't like, but none of them eat it. I have to vacuum the whole mess out.
I believe it's @ up there who has an adorable picture of snails eating a minI cut out pumpkin. I"m growing pumpkins and I'm hoping I can do that this year.
I changed computers last year and can't find the picture of ALL of the snails eating it ( there was at least 25 of them on it ) but I found these - the pumpkins are a hit every year and they go for 1/2 the price right after Halloween so I load up on them. If left uncut, they last at least 4-5 months stored in a cool place in the pantry.
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Adorable! So you just carve it and scoop up all the seeds? I'll definitely have to try this with my snails and after I get my new bn pleco.