Variations In Specific Gravity

[NOTORIOUS LEE]

Hi Guys,

Just a quick question on Specific Gravity this time.

I have an open top tank so therefore lose water each day through evaporation.

My question is how much do you let your salinity rise before topping up the water?

[Loverotties]

you really don't want to move alot.It can add stress to your tank mates.Buy or make a auto top off.It was the best thing I did to my tank.I fill it up evry week or longer,and I don't have to worry if I'm on vaction!

[VWD]

Hello, I top off everyday , 1-2 gallon , If You keep up with it the salinity should be ok , You can use a float switch and have it do it for You , My tank is open top but even a closed Canopy will evaporate, I don't think You have to worry about it , Vince

[SPC]

I use a dosing pump so mine does not fluctuate at all day to day, but I think the real question is how much fluctuation can be tolerated by the animals. I can't remember reading any science data on this but I'm sure some is out there. I believe that Spanky has said that on the Keys reefs the PH and salinity can vary quite a bit due to daily environmental factors (tides, rain fall etc...), but I don't remember any exact #'s. Maybe he will see this thread and comment.

Steve

[NOTORIOUS LEE]

Thanks guys.

Does anyone know any good links to designing a top off system?