1.029
- Thread starter youtoo54
- Start date
little_fish
Moderator
Yes, i would do some pure water changes
Reef Nutz
Reefing newb
Fish only tank 1.018 and up
Coral tank 1.025-1.026
Toss out some water and put in fresh.
Coral tank 1.025-1.026
Toss out some water and put in fresh.
Bifferwine
I am a girl
+1 everyone.
Smitty
Reef pro
But don't bring it down too fast suddenly...gradually lower the salinity level over a few days so you don't shock your inhabitants.
wontonflip
I failed Kobayashi Maru
+2 everyone. There's nothing in there yet, right? I think he's still cycling it. Definitely take OUT some saltwater first, then add fresh. Even though it's empty, you've still been topping off w/ rodi right? If you have not, then the salinity went up when the water evaporated. If that's the case, just top off. Otherwise, take out salt, add in fresh :)
Bifferwine
I am a girl
It's okay to drop it gradually, over a few days.
parrotchute
DUSTOFF MEDEVAC
Here's the formula:
X = amount of water you'll be adding (i.e., how much in gallons you want to add to change the salinity - the larger the change, the more gallons you should do it in)
Y = total water in your system (not the size of your tank, but the amount of total water)
Z1 = salinity you currently have
Z2 = salinity you want
Z3 = salinity to have in the water change bucket
Plug it into this formula:
Z2 * Y - ((Y-X)*Z1
----------------------- = Z3
X
So, to simplify: If you have 75 gallons total water in your system, want to change it from 1.022 to 1.025, using a 5 gallon water change, substitute all those values in above. Z3 comes out to 1.067. So you'd take 5 gallons out of your tank, and replace it with a well mixed 5 gallon batch raised to 1.067.
X = amount of water you'll be adding (i.e., how much in gallons you want to add to change the salinity - the larger the change, the more gallons you should do it in)
Y = total water in your system (not the size of your tank, but the amount of total water)
Z1 = salinity you currently have
Z2 = salinity you want
Z3 = salinity to have in the water change bucket
Plug it into this formula:
Z2 * Y - ((Y-X)*Z1
----------------------- = Z3
X
So, to simplify: If you have 75 gallons total water in your system, want to change it from 1.022 to 1.025, using a 5 gallon water change, substitute all those values in above. Z3 comes out to 1.067. So you'd take 5 gallons out of your tank, and replace it with a well mixed 5 gallon batch raised to 1.067.
