I have four mystery snails and I have noticed that their shells are discoloured at the front. My PH is 6.5, ammonia 0, nitrite 0, nitrate <20. The tank mates are one blue dwarf gourami, 3 Molly fry and an albino pleco (I think). I was wondering if it could be from having such a low ph or a calcium problem. I don't have a test for calcium if there even is one. Could it be from them growing? Any help would be greatly appreciated.
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