hi thanks for the help, the tank is 48"x15"x12" i think its 128l.
it is a community tank with 7neon tetras, 2black widow tetras,5platys,4mollys, 1silver shark, 3harlequins, 2congo tetras, albino red tipped shark (botia??), black red tipped thing^^, 3danios,2 plecs, 3 gouramis, 2 clown loaches, 1upsidedown cat, 18baby platys in a breeder tank, male and female fighters.All these fish are healhty. the elephant is now dead

All the levels are ok, checked them myself and got a good fish shop to check them and he oked them.
also the anus looks fine. urgh.
a whitespot treatment i found said it wasnt suitable for fish with skin ie the clowns and elephant nosed.... they gave me MELAFIX and advised me to add aquarium salt