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Whats a good calcium supplement to add to my tank for my snails. I was thinking of puting old sea shell in my tank ?Hi & welcome to Fishlore. A ph of 6 is a bit low for some fish but fish will get used to it, it's more important to have a stable ph rather than chasing a perfect one which usually results in ph swings which is far more damaging to the fish. Your blue ram will be right at home in ph6 & it's not too far off for your tetras & guppies either & even the gourami they will all be OK at 6.8 but will acclimate to 6, your snails will be OK even though they prefer water a bit harder but if you add some sort of calcium supplement for them they should be OK. If you do want to raise the ph a bit do it slowly so as not to shock the fish & it's best to use natural stuff like almond leaves, bog wood & peat moss to do it rather than adding chemicals. Slightly off topic but just FYI you may get some aggression between the gourami & the other fish depending on the gourami type (some can be very aggressive) & also if the assassin snail doesn't have another source of food (like pest snails) it will likely attack the nerite when it gets hungry.