salinity too low in cycling tank

[Angelajean]

Hello,
I followed all the directions for the Kent Marine reef salt that I am using, but my salinity is too low. It is 1.021 according to the floating hydrometer and the instant ocean one with the arrow arm thing. I also used a pump on it for a day before putting it in the tank.
Should I try to raise it and if so how?
I am going out of town for a few days so over 4 days I will probably have some evaporation during that time.
Oh and BTW, I have ordered a refractometer. It'll be here next week. There is nothing living in the tank other than rock and sand.
Thanks,
Angie

 

[Kelz88]

I find i always have to use more then the mix states, now i just pour and mix lol. Just top up with saltwater until you hit your desired amount.

 

[Smitty]

+1 Kelz...also, the hydrometer may be off, so wait for your refractometer and test it again, and adjust accordingly.

 

[Bifferwine]

No rush since you don't have any livestock in the tank. I agree to wait for the refractometer then adjust it at that point.

 

[Angelajean]

Are the refractometers on eBay okay? My parameters are heading in the right direction so if I get the salinity straight I'll be good.
Ammonia .25
Nitrite .50
Nitrates 0
What should my salinity be for fish and coral? I think it is suppose to be higher for coral but why?
Thanks,
Angie

 

[Bifferwine]

The ones from Ebay are fine. Did you get the calibration fluid with it? You will need that to make sure it is calibrated. I think it costs $3 to $5 -- not expensive.

Natural seawater is 1.025 - 1.026. That's what you should shoot for in your tank.

 

[Angelajean]

I ordered the refractometer and calibration solution separately.

 

[Bifferwine]

That's fine, as long as you got the calibration fluid. :)