why do crayfishs break chela by itself

[James1976]

That's very low. Maybe add more shells until you get 7.5?
7.0 is neutral. Less than that is acidic.

thank you very much. i will try

 

[James1976]

That's very low. Maybe add more shells until you get 7.5?
7.0 is neutral. Less than that is acidic.

you are so kind, thanks

 

[duanes]

You can also add baking soda (sodium bicarbonate) to the water with every water change. and it should bring alkalinity and pH up.
Start gradually with a little at a time and bring the pH up to almost 8.

 

[James1976]

You can also add baking soda (sodium bicarbonate) to the water with every water change. and it should bring alkalinity and pH up.
Start gradually with a little at a time and bring the pH up to almost 8.

Is it possible that not a matter of water quality , it is an infectious disease.

 

[duanes]

Disease is always a possibility, the 1st one could have been a carrier.
But crustaceans such as crawfish need calcium for their shell to remain viable, and develop correctly, and the water parameters the OP first gave, indicate, (like low 5-6 reading of pH) a low level of calcium.

 

[James1976]

Disease is always a possibility, the 1st one could have been a carrier.
But crustaceans such as crawfish need calcium for their shell to remain viable, and develop correctly, and the water parameters the OP first gave, indicate, (like low 5-6 reading of pH) a low level of calcium.

you are right, thank you

 

[Noa123]

I add cuttlefish bone into my tank, I just break off a piece and put it under the sand then save the rest until I need it.