Adding water 24 hrs after change

[amatob4]

I know you need your add RODI as a top off, but I just did a water change in my 65 gallon 24 hours ago. I think once the F4 filter got running, it needed more water than I originally added. There are no leaks anywhere but the tank looks like it could use another gallon water.

This close to the water change do I use saltwater or RODI?

 

[Fish Fan]

Add saltwater at whatever salinity your tanks runs at. You're not trying to lower the salinity here, you just want to top up the running level of the tank. Adding RODI would lower the salinity of your tank.

I hope that helps!

 

[Tahoe61]

You have to measure the specific gravity to determine that.

 

[amatob4]

Add saltwater at whatever salinity your tanks runs at. You're not trying to lower the salinity here, you just want to top up the running level of the tank. Adding RODI would lower the salinity of your tank.

I hope that helps!

100% helps!!! Thank you! That was exactly what I thought but needed to be sure.

 

[gbroadbridge]

I know you need your add RODI as a top off, but I just did a water change in my 65 gallon 24 hours ago. I think once the F4 filter got running, it needed more water than I originally added. There are no leaks anywhere but the tank looks like it could use another gallon water.

This close to the water change do I use saltwater or RODI?

You use RODI to replace evaporation.

If you lose water due to leaks, adding stuff that fills with water like a reactor, or have removed water by drip acclimation of new animals - you replace the lost salt water with fresh salt water.

 

[Fish Fan]

100% helps!!! Thank you! That was exactly what I thought but needed to be sure.

To be fair, @Tahoe61 is right, you should measure the salinity as you likely had some evaporation in 24 hours, but you'll want to replace the water your canister filter used up with saltwater.

EDIT: And I believe what happened was that after your water change you turned on your Fluval FX4 canister filter, and that immediately pulled water out of the tank, lowering the running level of the tank. This water you replace with saltwater. Any evaporated water is replaced with RODI water.

 

[amatob4]

To be fair, @Tahoe61 is right, you should measure the salinity as you likely had some evaporation in 24 hours, but you'll want to replace the water your canister filter used up with saltwater.

EDIT: And I believe what happened was that after your water change you turned on your Fluval FX4 canister filter, and that immediately pulled water out of the tank, lowering the running level of the tank. This water you replace with saltwater. Any evaporated water is replaced with RODI water.

I think you’re exactly right that is what happened. No way I had that much evaporation over night since the water line is about a 1/2” below the…I guess it’s the trim around the top.

 

[Mr. Mojo Rising]

Is a water line the only way you have to measure the salinity? You really need a salinity tester, it’s an absolute must

 

[amatob4]

Is a water line the only way you have to measure the salinity? You really need a salinity tester, it’s an absolute must

No…I have both a refractometer and a hydrometer for measuring. Im not sure how looking at the water line would give me an indication of salinity levels. I only pointed out the level to demonstrate I did not believe the drastic overnight drop was due to evaporation. Thank you though, for pointing out those tools are an absolute must in this hobby.