Hello I’m new to posting on here but have been reading through the site for years and it has helped immensely!! So im hoping someone might have an answer for what possibly happened to my clown cause I am stumped sorry for the length of it but here goes so I’ve had this tank set up now for many years and all fish have been in it for at least 2 years with no deaths and no disease parasites or problems at all, everything was quarantined prior to being introduced I’ve been extremely careful because I’ve had to tear down a tank before n I never wanna do it ever again, it all happened really fast after lights went on in the morning I put a seaweed sheet in for my PBT and angel like I always do and the pair of clowns swam up outta they’re anenome up to me like they always do looking perfectly healthy and fine I came back maybe 30 mins later n noticed the male going crazy in the corner n see the female was pale looking laying on the bottom motionless then sprung to life freaking out darting all over the tank and then dove to the bottom spinning in tight circles actually digging down into the sand like an auger then went stiff and was dead whole process was maybe 30 seconds, everyone else including the other clown is fine other than his now broken heart from losing his wife and I have several way more sensitive fish than a clown that are fine all corals/inverts are fine water parameters fine fish get a varied diet of frozen foods with garlic and selcon and all have looked great for a long time but I’m still losing sleep over this wondering if this is some kind of mysterious illness that has no indications of being there that is gonna wipe out all my fish any day now or if it maybe just got injured somehow? Anyone experienced anything like this??thoughts??