Fin Rot Question, How Fast Can It Appear?

[star4]

How long would it take fin rot to destroy a fish's tail? I just have a strange thing going on, one of my coldwater fish lost part of its tail last week, it looked like it had been cut with scissors, its was that straight. I initially though it had been caught in the filter somehow but the dorsal fin was the same? After a week in the hospital tank the fins were growing back fine, no fungus or anything. The fish was put back into the main tank at around 8pm last night, but this morning the top half of the tail (which was fine) is all ragged and the dorsal fin all the new growth has gone and its all red. Would fin rot take approx 2cm of tail in 12 hours?

Fish is now back in the hospital tank again.

 

[fluffycabbage]

I was reading only lastnight Star, a post on here where a fish had almost all its tail fin disappear practically overnight, then it happened to other fish too Not nice.
Has he been given meds? x

 

[star4]

Yes she is back in the hospital tank now, I used Melafix first time round & daily wc, it healed really quick and the finnage had grown back by about 3mm. Now I have used esha 2000 because of the redness. Weird all the other fish are absolutely fine, water stats are ok. My poor princess looks like a ragamuffin Good job I am getting a bigger hospital tank the weekend she is not happy in a 70l tank

 

[fluffycabbage]

Yes she is back in the hospital tank now, I used Melafix first time round & daily wc, it healed really quick and the finnage had grown back by about 3mm. Now I have used esha 2000 because of the redness. Weird all the other fish are absolutely fine, water stats are ok. My poor princess looks like a ragamuffin Good job I am getting a bigger hospital tank the weekend she is not happy in a 70l tank

awww poor girl well at least i can help her feel a bit better eh yeah its weird that the others are fine

 

[Twinklecaz]

Is it possible one of the other fish did it?

 

[coldcazzie]

Is it possible one of the other fish did it?

that's what I first thought as well - it's very suspicious that it happened again as soon as she was put back in your main tank. Fin rot wouldn't be that specific....

 

[N0body Of The Goat]

I'm thinking aggression damage too, as other fish would show signs of finrot in the main tank.

 

[WILDER]

How many gallons or litres is the tank.
How many fish and which type.
Water stats in ammonua, nitrite, nitrate, and ph.

 

[star4]

Been watching the tank most of the day, one of the smaller koi is now sucking on the fins of one of the others so it is down to aggression?? never known koi do this before not out of spawning season anyway.

 

[Athena]

Have a Google for cannibalistic koi and you'll see it's fairly common in koi siblings, apparently.

Athena