What has killed my Siamese Fighter? I have a Silver shark, albino frog, Angelfish and some mollies?
Any of those could have done it, you don’t have a well stocked tank. The Silver Shark I presume is a Bala, they get 12″, are very skittish and can nip when they’re not in their proper shoal (should be in a minimum of a 6ft tank with at least 5 individuals). Angelfish are territorial cichlids known to attack Bettas, Gouramis and Guppies, and a large one would think nothing of eating neon tetras. Mollies are known bullies and fin nippers also. As for the albino frog, its an african clawed frog that will get tennis ball sized and eat anything that fits in its large mouth.