Salinity question

[Rafanho]

Hi,today i notice that my corals dont look happy,most of them are closed...
Water parameter:
Temp:78
PH:8
Alk:10
Amm:0
Nitrato:0
Phosphate:0.06
When I checked salinity is was 1025 in my refractometer.
But my hydrometer show 1022..
So I tried to calibrate my refractometer using rodi water and set to 0..
Now it show as 1028...
Really confused right now..thanks

 

[Rafanho]

 

[coralfishreef]

It is recommended to use a calibration solution for prism brine refractometers.

Unfortunately, I’ve bought 4 different brands of solutions and 2 of them were off. I ended up buying a Milwaukee digital refractometer that can be calibrated with RODI, but you could also just make your own solution and save the $.

http://www.reefkeeping.com/issues/2004-06/rhf/

 

[coralfishreef]

Those can be slightly mis-calibrated from the factory, but the nice thing about your glass hydrometer is it doesn’t require calibration. Just test your water at 77 degrees or whatever the manufacturer recommends. If you find your hydrometer is slightly off, just note that and remember the offset, then use your hydrometer to calibrate your refractometer.

 

[Rafanho]

Thanks alot

 

[nilaydeshmukh]

Beyond the salinity issue, I would like to believe that your Nitrate and Phosphate is too low. In my experience, corals (especially soft and LPSs) don't do well with near zero nitrate and phosphate. Good luck!

 

[508jfisher]

Hi,today i notice that my corals dont look happy,most of them are closed...
Water parameter:
Temp:78
PH:8
Alk:10
Amm:0
Nitrato:0
Phosphate:0.06
When I checked salinity is was 1025 in my refractometer.
But my hydrometer show 1022..
So I tried to calibrate my refractometer using rodi water and set to 0..
Now it show as 1028...
Really confused right now..thanks

Go with calibrated u wanna bring that down I almost melt my cyphastria being at 1.3 I couldn't believe how off my salt was then I bought a refractometer just make sure every time u use it it's calibrated

 

[Rafanho]

What is the best way to calibrate?I am doing with rodi water setting to 0...but I heard it's not 100% accurate...

 

[508jfisher]

Only thing I ever found that was accurate to a t was the Hanna salinty checker it's 80$ on Amazon

 

[508jfisher]

But yes that's what u want the blue and white to be at zero with rodi water and try and take the water from near rock scape

 

[Joe Rice]

My understanding is that the floating glass hydrometers are considered to be quite accurate. I would trust that.

Tropic Marin HIGH PRECISION HYDROMETER, claim's it's super accurate and never needs calibrated.

Brs started selling this, Tropic Marin HIGH PRECISION HYDROMETER, claim's it's super accurate and never needs calibrated. Anybody buying these claims? https://www.bulkreefsupply.com/high-precision-hydrometer-tropic-marin.html

www.reef2reef.com

Also calibrating a refractometer to 0 with RO/DI isn't going to help. You need to get calibration fluid closer to 1.028.

Refractometer Calibration Solution

Keep your refractometer readings accurate! A refractometer is easily one of the most important tools to have if you own a saltwater tank. Without a refractometer, we would be guessing at how much salt is in the water, and more than likely would not be correct! Even if you have a refractometer...

www.bulkreefsupply.com

 

[Jim Tansey]

Only thing I ever found that was accurate to a t was the Hanna salinty checker it's 80$ on Amazon

How did you find the Hanna to be accurate?