Snails dying in low-tech nano
I have a 1 gallon cube tank with some plants (moss, hornwort, baby tear) and balanced water along with a betta and mts snails. Everything is growing well, except that my snails are not able to survive beyond a certain point...too many snails are at the bottom of the tank.
I have fluval substrate (for plants) and use normal tap water (NYC) to fill up the tank. Lights at 4500k.
Anyone have any ideas? Thanks!