First tank crash

[Tyler White]

Welp.

Its finally happened.

The tank is currently crashing and i am not sure what happened at this moment. I have my theory's right now but just about everything in my tank is STN/RTN'ing
Lost a TCK pikachu in less than 12 hours today while i was at work. Monti cap is in the process of bleaching out. Even the green slimer is showing some paleness near the base.

Only thing i can think of is a contamination either from the pest control person coming the other day (I watched them around the tank and they didn't get any spray near the tank) Or from my RODI system (cheapo thing i bought off of amazon) That has had the TDS creep up to 3-4 but i use that water for my other tank that is a more softy and zoa tank whereas the crashing tank is mostly SPS.

I did the biggest water change i could to get whatever thats in there out of the tank and took out my bag of GFO and replaced it with another stuffed bag of 3/4th carbon and 1/4th GFO for good measure to try to stop this madness.

My levels are within where i want them

ALK 11
Calcium 470
Mag 1370
Nitrate .5
Phosphates .04

I just want to see how you all have moved forward after something like this and to get me to checking something i haven't thought of. Appreciate anyone who's read this far!

 

[Jon Fishman]

Check temp with a different thermometer?
How do you test salinity? A probe?

 

[Tyler White]

Temperature is controlled by my apex and i have one of those glass thermometers with the suction cup and a little digital probe to make sure and theyre all in the same range which is around 78 give or take half a degree
Refractometer that has been calibrated and checked multiple times at 1.026 My apex has its own sensor but im convinced that thing is never right so i dont pay attention to it.