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I rejoined the hobby back ~2016, and everyone seemed to agree that 1.025 was the perfect salinity. Lately though, more and more I've been hearing that 35 ppt is what you should target for mixed reef or SPS dom. It's strange to me that these are often used interchangeably, since 1.025 is really...
If the organisms in the aquarium are from brackish environments with lower salinity, or from the Red Sea with higher salinity, selecting something other than 35 ppt may make good sense. Otherwise, I suggest targeting a target salinity of 35 ppt (specific gravity = 1.0264; conductivity = 53 mS/cm).
I just bought a Hanna salinity checker and checked both the water I was mixing and the tank water. For a while I’ve been using a secondhand refractometer, which I’ve never calibrated myself (rookie mistake, I know). I’ve always tested it to ppm, and it’s come up as 1.024 specific gravity.
A=Current Tank Salinity C=New Water Salinity t=Total aquarium volume r=Removed volume of water R=Remaining volume of water D-Desired Salinity (edited) Here's are some examples of it working. Say you have a 80 gallon tank, the salinity is sky high at 1.030, and you're wanting to do a water change to correct it.
I have my apex salinity probe calibrated at 35 ppt and its accurate at that point. But if there is a slight decrease or increase in salinity it overstates the change if that makes sense. I have over 200 gallons and 1-2 gallons of extra fresh water has my probe saying I’m at less than 32ppt which shouldn’t be the case and I check it against ...
Otherwise, I suggest targeting a salinity of S=35 (specific gravity = 1.0264; conductivity = 53 mS/cm). Table one is shaded with a rough guide as to where I think salinity is best maintained, but the exact salinity in the range of 32 to 36 ppt likely makes little difference except to values for important parameters such as calcium or magnesium.
So I got a Hanna Salinity Tester which by default is in ppt and the calibration packets are by ppt but can also measure by S.G.. Now, I heard that ppt is a more accurate measurement (correct me if I'm wrong) since it's based solely on salt, while S.G. factors in temperature (which gets...
What are you using to measure your salinity? If it's a swing arm type hydrometer it may be giving you a bad reading, i.e. micro bubbles on the arm will cause a high reading. Ultimately, it would be best to use a refractometer that has been calibrated with a solution that is at the refractive index of the sample you will be testing, i.e. a SG of ...
- describe as good as possible „how“ you are measuring salinity of your tank ——— Here are reasons that might bring salinity up too high A) the saltwater you use for changing has a too high salinity from begin on Several reasons to get this: In General the amount of salt mixed per gal then was too high Q: which salt mix did you use
Raising the salinity can be pretty wasteful if you drain water out of the tank and replace it with slightly more saline water. Many people end up making strong brine solutions and mix that in slowly. Beware though; if you dissolve sea salt at a salinity higher than about 50 ppt, subtle changes can occur, including precipitation of carbonates.