Went away for a week, came back to 1.60 salinity...??
 

ATO was working perfectly.

No fish losses but all of my coral are affected, my clam detached (after 2 years in the same spot) but seems okay.

Most coming back, some will have to wait and see.

Cyano and dino flare up all close to gone now.

In any case, can't figure out for the life of me how this happened?

Any thoughts or suggestions?

I read the number wrong LOL. Never mind....

Is your there a chance your ato was topped up with salt water? I had left a bottle of salt water by my tank after a water change and went away for a weekend. My daughter ended up refilling the ato reservoir with this bottle of salty water rather than ro water. She didn't know as I didn't tell her, luckily it was a 1/2 full 5 gallon jug, so not a huge impact. Any chance of something like this happening?

And then there is the brite side

Tom R

What are you using to measure salinity/SG ?

I use a regularly calibrated Vertex refractometer.

I actually tested my top up water and it was 0 on the same refractometer.

To clarify, the Dino and Cyano happened due to the salinity increase, and now, after 3 30 gallon water changes (it's a 95 gallon tank with 60 gallon sump) we're back to 1.24-1.25 and the dino's are all gone with very little cyano in some lower flow spots remaining.

salinity is 1.6? salinity of NSW is like 35... So you essentially have a fresh water tank now?

thought fresh water is at 1? 1.6 is like triple the natural salinity...

I thought he meant maybe his SG went up to 1.060 from 1.025 or whatever he normally keeps it at.

do u dose as well? I noticed mine climbed from 1.025 to 1.031. only thing I could put it down to was dosing.
I think specifically it was magnesium. I was trying the whole add tons of mag and hope the algae will die off trick... never got it to work.