I have a 20 gallon long with two clownfish and a cleaner shrimp in it. Everything was totally fine and happy until today when I arrived home to see one of the clowns dead and the other one just barely hanging on. The clown that’s alive in laying on the bottom of the tank breathing extremely fast. These cleaner shrimp is unaffected and being totally fine. I texted the water and all parameters are totally fine. The salinity is great as normal. And the temp is the same as well. Nothing has changed since I got them a couple months ago. The tank was cycled when I got them and they were so happy. I added seachem stability, pimafix, and melafix. someone please help me. I don’t want to lose my second clown.