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Hi there, I've recently been wanting to start a crayfish tank so I purchased a Blue Pearl crayfish, Cherax Albidus, two weeks ago. He was put into a cycled 10 gallon tank.
The crayfish seems to be doing well and is just getting used to his new home. I thought he might be getting ready to molt but the past few days he has been coming out much more. Since I got the crayfish he's been eating every day, so health wise there doesn't seem to be an issue. The water parameters are good as well, 0 nitrites or ammonia and very low nitrates. I've been trying to get the pH down (so far successfully) with peat moss granules as the water is too hard for this crayfish at 8.0, and my other cycled tank seems to be at around 7.2 but that tank has been established much longer and with larger pieces of driftwood.

Anyway, let me get to the point here. I may have been a little hasty dropping him into the 10 gallon, not fully considering its potential full size. I felt bad seeing him walk around in that small tank looking for more places to go, so I purchased a 20 gallon long tank.
I'm not exactly sure about how I should proceed with the move, as I'm very nervous about scaring the crayfish and causing too much stress.
How can I do this while causing as little stress as possible?
I plan to use the old tank water in my new tank, along with the gravel and cycled filter media. How long should I wait before moving the cray into the new tank, figuring that it will have a pretty much instant cycle? I have a water-holding shrimp net that I think will work well for him (he's barely 1 and 1/2 " long, if that) and a breeder box I can place him into after netting.
I'm also nervous about moving the cray before he potentially molts so I don't want to mess that process up. Should I just wait until whenever he does molt? Does anyone have any experience with successfully moving a crayfish and having it molt soon after?

Sorry for the huge amount of text, I'm just nervous about harming my crayfish, he's such a cute and fun little guy to watch so far and I want to provide the best care I can.
 

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Having high pH doesn't necessarily mean you have hard water, and adding peat mos granules doesn't necessarily make your water softer.


You need a liquid GH and KH test kit to figure out what hardness your water is and to better help control pH, if you want a lower pH. Those test kits plus a TDS meter to ensure that the new tank is as close to the old tank, parameters wise. Not necessary


Old tank water doesn't really help with cycling a new tank, but it can be good for trying to keep the parameters more stable.


If you have a way to keep your crayfish in the 10g or another tank while the 20g runs for a week or so to ensure you don't throw it into a mini cycle, that would be a great option. Then double check all parameters and transfer over.
 
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