Tunze Top Off vs snails

Grumpy Vet

Hi all.

I have a nano Tunze auto top off on a 29 gal tank. It works great when my cleanup crew is minimal. I recently re-stocked the CC and the lil snails keep infiltrating the float switch. My reservoir isn't huge - but it definitely gives a SG swing more than I'd like and messes up my skimmer.

Anyone know of a good fix or product I can buy to solve this issue before I try my hand at DIY? A snail guard for this? Retrofit the float? I use the switches from autotopoff dot com for the sump in my main tank. They are a little obtrusive and bulky for this tank in the living room. Can I hybrid the two?