need help not sure what’s going on

[Oscarfishkeeper000]

My kissing groumais started acting off they started staying at the bottom of the tank more often not moving or even messing abt with each other there in a 220 gal tank with a Oscar a jd a silver aro a flag tail a synadontis catfish and a salfin pleco this morning I woke up to one of the groumies dead and the others just sitting in the corner of the tank same with all my fish rn it’s weird there all on the left half and not the right does anyone know what’s going on and what will happen to my other groumai please help it’s not like it’s aggression no marks on the fish and they’ve with each other since juveniles please help no idea what I’ve done wrong

 

[kno4te]

Try and check your water quality. How often are you doing water changes? How long have you had the gouramis? What are you feeding? How big are the fish? Can try moving to a quarantine tank for now with some salt 1 tsp per g. Dim lights and avoid stress for now.