I lost 5 fishes in a span of 2 hrs.. i happened to change the entire water of the tank about 3 hrs ago..and i also added 2 swordtails to the tank ...is it because i added the swordtails ,the deaths?? or because i changed the entire water of the tank??? i lost 1 guppy, 1 dalmation molly, 1 widow tetra and 2 yellow tetras... pls help.. i dont wanna loose the others as well.. i have 2 angel fish, 1 guppy, 1 white molly, 2 gold fish and 2 sword tails in the tank.. wht do i do to save them?? i just removed the dead fish from the tank... should i change the water again???pls reply as soon as possible