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![]() 1.022 to 1.026 is normal for FO and FOWLR tanks albeit there is no good reason to have it any lower than 1.025, where reefs should be 1.025 to 1.026.
![]() Best bet it to either buy a refractometer $50-60 and periodically recalibrate your hydrometer (I've seen them off by as much as 0.008), or take a water sample to your LFS and get them to test with a refractometer so you can figure out how much yours is off by. I have two hydrometers (one is SeaTest and one is Coralife...I think); one is under by 0.002 and the other is over by 0.002. For a really rough guestimate...about 2 tbsps will raise the sg by about 0.006 or 7 ish in 5 gallons. This is just my guestimate from mixing salt up in my buckets. |