Is there any cure for dettol dosed fish?

i recently washed my tropical fish tank gravel with a very small dose of dettol diluted with a bucket of water, thinking it would clean it up well, as the white peices were green, it did work but half an hour after putting the gravel back in and the water going cloudy i noticed only the neons floating upside down, then a red eye tetra, then all the other fish started grouping up unusualy. i have changed as much water as pos and put the worst affected fish in a net in other tank.