I had a baby royale gramma die on me. The fish shop guy put two fish from different salinity levels together. The royale gramma asphyxiated with its mouth open because it was not properly acclimated. I would recommend doing the full acclimation process with fish. With inverts i always just toss em in and they survive every time. The one time i only floated my bag and put a scoop or two of water then introduced a fish. It died within 12 hoursI have a few pics small one is from Petco bigger one was from online I floated the bag for 30 minutes before adding the fish none of them seemed like they had trouble breathing but both died with their mouth open the Petco one died when I was at work and the one from online died when I was sleeping so sadly I couldn’t see what was wrongWhen you ordered on-line did you pick up in the Store or was the Fish Shipped? That can make a difference when acclimating. Your parameters seem fine and you have an airstone going so I see nothing wrong with your Tank Setup. Chances are your Petco Live Rock brought in some parasite and your Grammas are getting sick. You need to post pics and a Video for us to diagnose your Fish. The main thing to look for is elevated respiration levels. If they were breathing hard or fast it usually means a Gill Parasite like Velvet. That can kill a fish in a matter of hours.
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I have never ordered fish online only pick up
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The 2nd one asphyxiated because the guy working at the store was dumb and mixed 2 systems for my fish. The gramma was the one added into the other systems water. The other fish is still with me today. Ive gotten another fish along side each gramma and theyre both still with me while the grammas perished.