I just added a mystery snail to my 55 gallon freshwater aquarium. My PH has been at 7.4 for 5 or more years-never fluctuates. The GH has been (6drops)100 ppm, and KH 2-3 drops. I am waiting for a meter to test TDS but it’s not here yet. My question is with available information do I need to supplement calcium? Will it raise my ph? I’ve never added snails or shrimp to my tanks before and want to make sure the snails is ok, not changes other perimeters in my take harm my fish, snail, or future bamboo shrimp. My fis have been very healthy and rarely ever loose one. (They will die of old age eventually)