Changing the salinity from 1.018 to 1.025 is a big change and should have been done in smaller increments

I will assume the pH also had a big swing. Did you happen to measure the pH before you added all of this new SW water (which had to be quite a bit to get the water in a 125g to change salinity from 1.018 to 1.025 !!)
I see you posted on 9/5 that your new skimmer (the first one you put on the tank I imagine) was making no bubbles. Is that still the case or did you get this fixed yet?
A skimmer helps add oxygen to a tank, without that making bubbles, I am sure you dissolved oxygen number is very low. Add that to the incredible overcrowding you have there (and I see you recently sold a panther grouper, a flounder and a niger trigger out of this tank...)
Also - you have been trying to buy a power head as recently as 9/11...do you have any on the tank at this time, if so what type and how many?
I also see you were trying to buy more rock last weekend. Did you find any and add it to the tank? Was it fully cured??
Can you please post a pic of this tank?