dead cory

My platy and probably cory that I just bought yesterday I woke up to find dead. The reason I say the cory is probably dead and not certainly is that I can't find it, or any remains of it in the tank. I'm assuming my snails ate it since they were already picking at the platy when I had removed...

Not sure why or how my cory died but I found him because I couldn't find all 5 of them when eating. He looks white I don't know why this is or what happened to him to make him look this way or how he died. Any help would be very nice. Also found an empty snail shell next to him don't know if it...

Last evening I get back from work and my partner tells me one of my fish is dead . An adult bronze cory had died not sure of the age as bought full grown but I hear they live a good while so not putting down to age , I water test and it’s not great but not bad , Gh 160 KH 40 Ph 6.5 No2 0 NO3 60...

Ok on the week end I swapped most of my gravel to sand and purchased 5 peppered corys feeling bad for them because they were hiding I buy another 2 and put them in , it worked and the others came out and joined up with them , Problem the first 5 were around 3cm the second 2 were smaller around...