i have tried with a racoon butterfly (this guy lived for a little over three weeks in the DT) a pearl scale (dead a week after qt) a latticed butterfly (dead within a week of entering DT). i really really dont understand whats up with these fish. they go through QT the tank is 4 footx2 foot they are fed mysis clams and butterfly coral cubes i add vitamins to their food the tank has zero ammonia gets kept around 10-15 nitrates has all the bells and whistles uv refugium etc tank is over a year old and has almost 200 lbs of liverock in it.....PLENTY of caves to hide in. the other fish in the tank are peaceful fish, birdwrasse, melanarus wrasse, clownfish, bangaiis and pajamas, mollies and hawk fish and my big derpy dog face who doesnt mess with anyone and is even super polite when feeding and waits his turn. every time they die the same way they hit the sand bed for around a day and then just never get up from laying down. my racoon just started doing it and as always i was able to pick him up with my gloved hand because he just randomly got so weak for no reason and so i euthanized him, sad stuff. he was literally about to jump out the tank yesterday for some mysis and today he was like this, with absolutely no signs of disease on fins or skin and his gills also were not inflamed. im just stumped because i put so much into these fish on a daily basis and spend all this money on high end equipment and other things and all my other fish do great and at this point i hardly need new fish but ive tried quite a few times for my last fish to be a butterfly and it NEVER works. any advice for these guys? i feel like even after all the research i do on them they just nope out of life in my tank and i have no clue why. if it matters Chloroquine 40 mg/gal for the racoon and copper safe 2.0 ppm for the others and prazi at normal dose is how i QT. maybe even better yet any fish that offer the same kind of body shape as a butterfly without all the BS?