I got a sapphire cichlids in the mail yesterday along with 3 other cichlids and put them in a 55 gallon quarantine tank. The fish was acting normal and eating last night and did not appear to have any health concerns (1 other fish did appear to have ich). I started the tank on some Paraguard and the fish with ick is already showing improvement. I found the sapphire cichlid this morning laying on the bottom gasping. It’s pretty much always laying on the bottom, sometimes it will adjust itself if it starts to lay sideways. I checked water parameters on my 2+ years cycled tank and came up with 0 ammonia 0 nitrite 0 nitrate and 8.0 ph. It has a 265 gph canister filter. The tank previously housed goldfish with no issues. I proceeded to do a 75% water change. Temperature is 80 degrees and all the other cichlids appear to be swimming around fine. I was soooo looking forward to the sapphire cichlid the most, I don’t want him to die… I probably won’t be able to get him replaced since it’s been like 12 hours.