If there are more snails when you start adding fish food, it's simply because there's extra nutrients available there. The snails will help break down the food + waste more quickly so the plants can use them faster. Really the only issue would be if the snails are visually unappealing - in this case, maybe try to get your MTS population up. Since they're often buried during the day, they aren't as easy to see. In my tank, the MTS have out-competed the bladder snails quite a bit; I hardly have any at all anymore, whereas it used to be absolutely infested like yours. Along those same lines, you could add some prettier snails, like ramshorn/nerite/etc to increase the competition.Yes, what I worry about is: if they're doing great now (with no fish food and fish waste to feast on, only decaying plants), imagine how it'll be when they have an even better buffet! 🤣
Not only that, but I feel awful vacuuming the gravel now, because I know I'm killing several of them in the process.
I have no way out, really. I guess I'll just have to wait and see... 😬