Hey if you are a beginner I would start w/ a 10 gallon or smaller...everything will be easier to manage...I had a problem of jumping into CRS w/ a 30g to a 50g w/ little success....now I transferred my shrimps to a 10g and now everything is in place...good luck
I have them in 10, 20, 40 and a 55 gallon and all populations are doing quite well, as mentioned maintaining clean water with steady parameters is the key and that result is much easier to achieve in larger tanks.
I mainly house my CRS in 10 and 20 gallon tanks. In my opinion, it is easier to monitor each specimen in smaller tanks with the possibility of moving a few around easier for breeding purposes.
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