Dear Stan,

You have to recheck your latest posting.
2ppt ( not ppm ) salt is 2 gram per litre ( 1 litre being 1000gram ).
So 100 litre will need 200 gram and a typical 4 ft tank ( full ) is about 220 litre or 440 gram of salt.
The half hour bath call for a much higher concentration of 3% ( if I am not mistaken ) that is 30 ppt meaning 3 kg for 100 litre.
I have tried it once months ago none of them died although they were half dead after the half hour.

Beside the above, may I suggest that we state our reason for quaranteen.
That is to say, be more specific as to why we want to quaranteen.

Cheers!

BT Lee