I was not able to post in time to save all of three( one died today) but on sunday july 29 I noticed 3 of my 6 koi laying on the bottom of my temporary pond. The all had fins clamped and red streaks in there fins.
No new fish have been added.
They have been in this temporary pond (500 gallon hot tub.) if you will since October of last year while i construct a new 26000 gallon pond.
I have an 1800 gph pump with a uv light with a 2 stage 100 gallon biofilter with 2 water falls and 1 air stone.
Water is clear.
My koi range from about 8 in -12 in in size. (they are pet smart koi i wanted to start out with low cost on koi before i jump full blown.)
I purchased my house a few years ago and it had a very small 200 gallon puddle with 4 small koi only a couple of inches. Needless to say since i didnt know what i was doing i accidentally killed the originals by using city water to add water. (lesson Learned there.)
water test are as follows and have been at these ranges since before i put koi in the hot tub. The hot tub was not in use and had no chemicals in it i fushed the system several times to get any chlorine out of it.
I quarantined the 3 sick koi on sunday in a 40 gal tank that i have inside my house. the water temp is 70. i suspected it was septicemia but i dont have a scope and the nearest koi club is 150 miles away.
The 3 sick ones will swim if you touch them, but will soon stop and either sink to the bottom or rise to the top.
I started them on Maracyn_two. I have done an 80% water change everyday before adding new medicine.
The water parameters are as follows
nh3 0 (ammonia)
no2 0 (nitrite)
po4 0 (phosphate)
I have attached a couple of pics of the 2 that are alive and in quarantine. I also added a pic of the hot tub.