In my opinion, i would not replace 100% of the water. I have not personaly gone throught what you have described through out this thread, but i have had to compleatly disasemble my 75gal bow front and reassemble due to moving to new houses three times. I have always kept about 50% at all times, and this is due to the reliance of the built up bactiria in the water aswell Ls,Lr. The way i look at water is the more seasoned it is, the better it is for our little eco systomes. Just like wine the older the better.
On another note i'm truly sorry for your loss, my brother inlaw just went through a simaler desaster ..... it was not easy for for him and it was not easy for me to have to uthinize the ones that were suffering.
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