Zebra Nerite Snail Anatomy

No - they definitely don't eat it all by any means.  Each stick is about 1cm long and is said to last 5 days. I tend to use 1/5 of a stick every day but, even at that, there is more than enough food for the snails and the fish - it softens and expands (sorry - not sure of the official term) to become quite a large quantity. A snail can spend several hours in the pot, bulldozing its way through the food, but actually the amount consumed is barely noticeable. The pot can be occupied for 24 hours by one or the other snail, and they can adorn their shells in fish food in the process, and this still applies. The quantity consumed by the fish is again negligable. In fact, both fish and snails are messy eaters and it tends to be a matter of one or the other eating the debris that gets tossed up from the snails or falls from the fish's mouths as they chomp.

As Sue suggests, and also because the/my snails tend to be asleep in the morning when the lights are off and become increasingly lively as the afternoon and evening wear on, I tend to put the food in during the evening. That said, the fish seem to show little interest in the food until the evening, whether this is replenished food or the previous day's leftovers not yet taken out and replenished.

Therefore, I would have no qualms about this being a potential problem. If you'd prefer to try a few sample sticks (I mean your snails, not you personally ) before purchase, feel free to PM me your name/address and I'll pop some in the mail to you. After that, you could then decide whether to proceed and order them.