zebra snail

I was so excited to finally find a nerite snail at my local Fish store I didn’t even notice the shell was broken! Will this harm him in anyway? And what type of calcium could I give them to help repair it? a petco employee told me once I can give regular tums. If that right? And will that harm...

Hi everyone, I have a planted 6 gallon fluval edge with 3 inhabitants - 1 neon, 1 ghost shrimp, and 1 zebra snail. I have been neglecting my nerite snail's shell for as long as I've had her (about 5 years) and it's to the point that I think her shell may break in half. Please look at the...