salinity
The reasons they keep it so low is, the first is it is cheeper when you are talking the large quanity of water, the second being less chance of ick.
The low salinity speeds up the ick life cycle( which is usually 2 weeks) and there is less chance of getting ick at lowwer salinity.
I keep my fish only tanks at about 1.017-1.019
It is still saltwater.
AS far as the moray it would probably do fine as low as 1.012
I have had them before in 1.017 and they did great.
I never went lower then that.
Always aclimate very slowly when chaging salinity
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