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Thanks!If you collect it from the beach, just rinse it off under tap water and add the cuttlebone to the tank.
If you buy it form a pet shop, rinse it under tap water and add it to the tank.
There's no need to boil it.
I could see how that might work but I don't know that it's true. I'm giving it for the nerite to supplement their shell health, the water is already rather hard (I know that reduces the need for the cuttlebone but it doesn't hurt to give it so might as well)I've no experience with it myself but I read somewhere you could crush it into a powder and it will dissolve quicker in your tank water...sounds like a faff though. Do the nerite eat it? Or is it to condition your water?