Simply Koi and More Koi

I have been treating an ulser on a kois tail,I noticed this morning she had some raised scales near the ulser,so i have put her in a qt tank half full for now at 1.5 oz per gal salt,there is 75 gals so i put in 7 lbs of salt,are my maths correct !!! she does not like it rolling about gasping at the surface,have i put in too much salt? how much ct do i put in and how often?
Thanks in advance John

John,

I normally leave Duncan to answer health questions because he is the expert but your fish seems to be going into osmotic shock so you need to act now. Your calculation is correct for that concentration but the only time you should put a koi straight into high salinity water is as a dip. If you did need to take the concentration up that high you should only do it in three or four stages 12 hours apart.

I would suggest returning the fish to the pond in order for it to recover, or at least replacing 50 gallons of the water with pond water in order to reduce the concentration to ½ oz per gallon (0.3%).

Thanks Manky,I have returned her to the pond now,I will fill the qt up to 150 gals [ double water ] should dilute the salt and then add more salt over three days. How much ct should i add,and over how long?
Thanks John

ditto what syd said, to much salt to fast that's why she rolled on you

dunc

Thanks dunc,i have diluted it down now and put in first dose of ct.