Hi Bro,
Welcome to our reefing community. You mentioned that on the 4th day, you introduced livestock to your new tank. A few questions came to mind.
1) Are you using liverock, live sand and cultivated bio-rings ?
2) Did you cycle your tank ?
3) Have you check the water parameters?
It is important that you do not rush on stocking up when your tank is still new and might not be ready for livestock.
Just my 2 cents.