Natural seawater ranges from 34-37ppt (1.025-1.027 SG) and 35 (1.026 SG) is considered the average reading. Fish are generally tolerant of salinities much higher and much lower than this, though they may not thrive as well. Invertebrates however are not very tolerant of a wide range of SG. Ideally you should try to maintain your salinity at a constnat reading that is as close as possible to natural seawater. The biggest factor though is the stability of your SG. Sudden large changes in salinity are very stressfull to all inhabitants.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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