Salanity

[chocolate98]

What is the best salinity for a mix reef with fishes? When my salanity is about 1.020 my torch coral opens up until very big but when I raise the salanity to 1.025, I noticed that the torch coral does not opens up as well as when the salanity is at 1.020

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[chocolate98]

Salinity"

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[SubzeroLT]

How are you measuring your salinity? (eg. Swing arm hydrometer or optical refractometer)

I'm suspecting that the tool you are using is inaccurate. For most reefers, ~1.025 specific gravity is perfect for mixed reef.

 

[chocolate98]

ouh I'm using the swing arm hydrometer....

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[xiggie]

I would say the swing arm hydrometer is inaccurate , what you can do is get water from a good source , sea water or water from LFS or a reefer friend . Measure it with the hydrometer and check the reading , if it reads 1.020 then you should mix your salt water or dilute your tank water to to the same reading. 

Alternatively you can get a calibrated refractometer and use it to measure.

[chocolate98]

okay thanks for your advice!hopefully I can find a second hand refractometer coz it's kinda expensive....

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[newbie_reefer]

For long term wise get a refractometer.. corals tends to need higher salinity but fishes can tolerate lower salinity.. so we make it in between.. commonly ppl keep it between 1.025-1.027..

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[kohanson]

Yes, good to have a refractometer to ensure accurate reading. I have been running my mixed reef at 1.23 SG. I got mine from ebay at around $50 and make sure it is a reliable seller which have sold at least a 100 pieces.

https://www.ebay.com.sg/ulk/itm/320834650893