Blue Knuckles molting

jrock flimflam

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Howdy all,
Bought two Blue Knuckle Crabs from Petco to control some algae that started during my breakin period. Both have been pigging out and after 7 days I thought one of them had crawled out of his shell and got half eaten by a fish. It was sad.
Three days later spouse calls me at working thinking a new something was trying to move in to the shell. I get home and find a second half crab on the bottom but now I have two very alive crabs eating away.
I guess they both molted.
Within 10 days in my tank is this a good thing, bad thing, or normal thing?
They seem happy.
 
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jrock flimflam

jrock flimflam

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...and last readings were:
Salinity 1.024
Ph 7.9
Amonia 0.25
Nitrite 0.0
Nitrate 10
Calcium 420
Dkh 7.056
Temp 77.9
 

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