My tank has a lot of driftwood in it, so the water is pretty acidic (6.5 generally). I'm currently adding a lot more plants to it after upgrading the lights, and I would like to add some MTS or nerites to help with clean-up and algae control. And because I think snails are cute. But I'm worried that their shells won't develop due to the acidity. Has anyone had any experience with this issue?