I had a power outtage on Tuesday for 6 hours. Now I've been testing the water and doing a 30-40% waterchange each day and the parameters are 0 ammo, 0 trite, 40 trate. I have 3 hystrix rays (1 male 2 female) that are about 2 1/2 years old. The darkest female is having her disk torn up pretty bad and I've seen the male biting her several times this morning a lot more damage was done to her disk but also the tip of her tail is white and looks like its flaking. The other 2 disks and tails are nice and clean but she looks horrible. I'm wondering if its just the male trying to make whoopie. 180 gallon 2 AC110 and a rena xp4 while I'm building a new sump and temp is constant 82-83 degrees. No other tank mates and diet is massivore. Unfortunately my camera is toast but when I did the water change last night I added aquarium salt to maybe help with the disk and tail. She eats like a pig and has a solid cream colored bottom of disk with no pink or red irritation. Just looking for advice and thoughts. Also she has no twitching like I have read when there is something very wrong but I'm also wondering if it is disk rot but then why wouldn't the other 2 have it. Anything else I can do please inform me.