I have a female golden mystery snail in a 10-gallon planted tank with a betta (also female). She's generally healthy, and I suspect she's comfortable because she's been laying a ton of eggs recently. The specs of the tank are pretty decent: pH of ~7, temperature usually around 76 degrees F, almost no ammonia. However, my snail's shell seems to be weakening/turning slightly gray. I've tried feeding her blanched greens to help boost her calcium, but it doesn't seem to be helping much. I've seen a lot of people recommending cuttlebones to supply calcium, but have also read that it may not be effective in a tank of my size. Is it worth a try? If not, could anyone recommend a good calcium supplement that wouldn't impact my betta?