I have lost

three of my dear tankmates recently.. My male mickey mouse platy, my small Severum, and my Apple snail.
I think the platy was sick. It was sluggish, scales were all sticking out, staying near the top.
I think my severum died from bullying, since it was often being chased by my bigger one, which especially stinks because it was really pretty.
I have no clue why my snail died...

Disease? Old age? It had recently not moved much, so...
I am going to check the parameters again, just to make sure...
Its just hard to go through lots of deaths quickly...