We bought an established 125 gal aquarium 6 months ago and have had zero problems. The tank has a mix of fish and live rock. Everything has been great until I got home this afternoon to find my Puffer very lethargic with fast respirations! The water is slightly cloudy and my invertebrates are withdrawn, and the protein skimmer was pretty well full I normally never have to do anything to the tank as we have a local company clean and maintain the tank. They missed last week tank is slightly dirty nothing horrible. I ran and got a kit to test the levels. Ph is 8.4 Ammonia 0 Nitrates and Nitrites are 0 Salinity is 35. I have NO idea what to do and the local experts are not able to come help until "some time tomorrow" I cant just let my puffer die! any help is greatly appreciated!