Hi everyone! This is my first post and i am very thankful for this amazing forum as i have learnt so much reading the forums during my 8 months of koi-keeping. Unfortunately I am currently having some problems with my favourite sanke and i hope you guys can offer me some insights!
Firstly, here are my pond parameters:
Water volume : 8000 gallons
Ammonia 0
Nitrite 0
Nitrate 20
Ph 8.0 -8.2
Kh 90ppm
Temperature - 26-27 degree celcius
The reason i started the prazi treatment in the first place was because 3 out of my 16 kois were flashing from time to time and one of them likes to jump and gulp. Otherwise they were all behaving normally and eating well. I should mention that i have done 3 pp treatments back in May when i added a new fish ( i heard PP is less effective towards flukes/lice/anchor worms)
I will include most of my observations leading up to the sick fish as i know every little details is important
July 5
Praziquantel 80 grams and UV light turned off
Some fishes were flashing after the treatment
Heavy foaming is observed
July 9
20 % Water change with dechlorinator
July 10
2 kois were flashing after afternoon feed
Evening second dose of Prazi at 100 grams
July 12
Sanke has a reddish spiderweb like spot on shiroji under the dorsal fin and was less hungry , he is usually the most active and aggressive feeder in the pond!
From July 12-15 i was out on a business trip so my mother took over the feedings
July 15
I returned at night and saw that the Sanke had gotten worse. The reddish spot was bigger, skin looks rough, and he was flashing and yawning very aggressively, he was also started to clamp his fins.
Other fishes were yawning too but otherwise look normal
Immediately did a 10% Water change and filter cleaning
July 16
Salted to 0.50% based on dealer's advice
After that, A few of the fishes started gulping and yawning . I noticed some twitching fins and head shaking by the other kois
The Sanke is still swimming around and flashing
Stopped feeding
July 17
Did a 2ppm PP treatment in the evening
Pp stayed purple for 2 hrs
Sanke got noticeably worse as he is mostly clamping and resting at the bottom
July 18
20% water change in morning
No improvement on the Sanke
Other fishes behaved normally
July 19
Salinity 0.40
Second dose of 2ppm PP treatment in the early morning
Purple Lasted 3 hrs this time
Any idea what might have caused this? It is my first time using prazi and i had the impression that it was supposed to be a very gentle treatment but this is starting to be a nightmare
Also my pond has been foaming like crazy after the prazi and the salt made it worse. I am guessing it is normal?
Any help and advise is very much appreciated
Thank you!
Below is a video taken of the sanke when on July 16th
https://youtu.be/7s3_Wu-h0ik