Worried about new corals

Ok so this is my first time ever keeping LPS corals i have had a few softies in the past. Yesterday i got a a small frag of brain coral and a small frag of candy cane coral. Along with a leather, some polyps, and a red cauliflower coral. They all looked great in the store and i wish now i had taken pictures of them there when they were open and happy to reference too. Well they of course closed up when they were bagged. I brought them home drip acclimated them for close to 2 hours then set them in the sand and set my lights low (they had been turned off this whole time) i left the lights off all night then just let the timer turn the lights on the next day. Well after a full day of the low lights all my corals look way worse than last night.

My tank is a 75 gal with 20 gal sump. Has a 300 watt Mars Aqua led running 20% whites and 50% blues. Tank has been running for over a year and a half. Almost a 100 lbs of live rock. Only one pajama cardinal in it right now. I took a water sample with me to the pet store in houston tx which by the way is the closest good saltwater pet store to me and its a 3 hour drive. (I know i also need to get my own test kit). They said my salinity was high at 1.029 and that the nitrates were like 30ppm. So i should do a water change before acclimating the corals. So i changed out 15 gal with new ro/di water with hardly any salt to bring it down, and got the salinity down to 1.024 (all done with hydrometer because i havent bought a refractometer yet but plan to). Then started the drip. Anyways now the corals are shriveled up smaller than before and almost no color. They also look like they're peeling. Is there anything i can do to help?

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they are probably stresses from the salinity swing. The hydrometer is not going to give you an accurate salt measurement. I would say u need to get a refractometer asap
 
Looks new because i got a bag of new sand about a month of go to make the sand bed deeper and just installed over flows and such so they arnt algae covered.
 
Was speaking of the rock in the images. If you haven't set up tanks before, adding coral to a tank without the bio diversity etc. is not for the beginners per say. Best of luck
 
I also recently completely redid my rock work alot and got a new light. So that might contribute to the white look. Also when i put the new lights on the rock changed some and lost some purple.
 
Your new corals were probably shocked with the changes in salinity, lighting and perhaps alkalinity and its influence on pH. Looking at the pics on a smartphone *, I can't see the detail to opine on the state & recoverability of your new frags. Tissue peeling off is a bad sign.

I have no idea what "low light"'means on your LED fixture, but the LPS corals you have need low to moderate lighting long term. During acclimation they need even less. So I would get them shaded somewhat, get your salinity right, and now that you have stony corals, you need to test for and eventually manage alkalinity, calcium & magnesium. Good luck.

* Try less blue light & more white light plus more of a closeup when taking pics for diagnosis.
 
I will be able to as soon as my test kit comes in. I live out in the middle of the woods so i have to either drive hours or order everything to do with saltwater.
 
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