Hello, I’ve had a nerite snail for 1.5 years in a heavily planted 10 gallon tank with driftwood. My other nerite snails shells are fine but my black racer has a part Of it that’s disintegrating. Will adding a small amount of tums help? I’m worried about it hurting the water quality. Will eggshells work better, I think they take awhile to break down? Will a high ph harm my better? It’s low 6 and then 7ish after water changes.