Thanks guys for the kind comments. The tank is a 6 x 2.5 x 2.5 footer tank. Water changing regiment is daily for now till they behave to live with one another peacefully. That explain the ripped tails.
The situation have improved alot and once settled down, silvers will go back to meet the rest of the silvers in their own tank.
That bag is coral chips not ammonia remover or watever sort.
I dunno how many agree with me but I feel that overstocked tank is an art. And it's something which require alot of attention but very fulfilling IMO.