ASHLEY R COOK Valued Member Member

    Do u only supplement cuttlebone if you have soft water?
    I have very hard water and have researching crabs. Would I need to add supplement or just if they need extra calcium?
  2. D

    DutchAquarium Well Known Member Member

    the cuttlebone is to provide your crabs with a source of calcium to strengthen their shell. I actually recommend giving your crabs eggs shell that you have been removed of the protein skin on it. That way it doesn't pollute your water and is a cheaper way of getting your crabs their calcium.
  3. Rojer Ramjet

    Rojer Ramjet Well Known Member Member

  4. psalm18.2

    psalm18.2 Fishlore Legend Member

    I use cuttlebone. I boil it for a few minutes, let cool, and it sinks down in the tank. It takes a long time to disintegrate.
  5. Bithimala

    Bithimala Fishlore VIP Member

    I keep cuttlebone in all my invert tanks just so it's there if they want it. Not sure on crabs as I don't have any, but my snails and shrimp like grazing on it.