My biggest that I've had for 7 months has only molted 3 times so they are pretty slow growers. My three are in my 16gallon at the moment and are doing great in there.
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Ah I see, I wasn't willing to risk it lol I've got some boisterous black widows and didn't want them to gang up as one of the shrimp is only an inch. They'll be ok the the 5g for a few months then I reckon.