Originally Posted by Knrose
Hey I have a 5.5 gallon FOWLR
tank...I pre made water to the proper salinity and checked it with my refractometer. The salinity was perfect. Than I added it to the tank. After about 2 hours I checked it again and it was really low. I don't know what caused this. I've checked it at multiple temperatures.
Is your refractometer temperature-calibrated?
Temperature can affect specific gravity readings (with SG
variations potentially being more pronounced in small volume tanks).
What is "perfect salinity"?
What was the specific gravity reading when it was at 'perfect salinity' and what was it reduced to when it was "too low?
When your readings were taken at multiple temperatures what was the temperature range and were the readings consistently low at various temperatures?
How did your prepare your saltwater? (how long was the water mixed and circulated before being added into the tank?).