how can salinity double? Question 

justatank

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three weeks ago the Salinity was constant for 2 weeks
1.004 to 1.005

since them i have added 10% of the water, and Salinity is now 1.010?

only change is that fish went from 1 to 2 to 4 over 5 weeks.

Makes think i added Ocean salt, forgot to document it or even remember doing so!:nopity:
 

lanlesnee

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There could be several reasons for your salinity to go up. Evaporation, salt not thoughly mixed with water when you added it. If you didn't net the new fish into the tank and dump the water they come in into your tank, the water they came could be higher, raising your salinity.
If you using a hydrometer to measure it could have air bubbles on the needle causing a false reading. What temp are you taking the reading at? Different temps could causes different readings.
etc, etc.

I want to know what are you keeping at such a low salinity?
 
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justatank

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this is a brakish tank not Marine, Fish were in FW

I have 4 puffers "Green spotted", that came from 3 sources, only 1 was in Brackish water, so I am slowly increasing the salinty.

But I think I know the reasons for the high salinty, One Puffer came striaght from wholesaler, the LFS took my order, called me the next day and i picked up within 45 minutes of delivery to LFS.

I called the LFS, and they mentioned that the shipping water had 1.008 SpG, (they test prior to shipping and it was written in CODE on shipping bag

Plus about 10% of water had evaporated. and water temp was not logged,

I will log temp, volume, and Salinity

Thanks for clearing up
 

lanlesnee

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The jump isn't going to hurt you GSP. I would keep it there as your next step.
I let my GSP puffer tank salinity move around to mimic their natural habitat.
I keep my at 1.017 to 1.023. But they are older.
 
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