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  1. #1
    Junior Member Rank = Fry RagePotato89's Avatar
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    Looking for a 'sanity check'

    Hello everyone.

    First of all, apologies if this is posted in the incorrect section (I'm new), and also if you feel that this is a question that you've answered before a dozen times, but I feel that there is a degree of nuance to way in which I am asking the question.

    Okay. Deep breath.

    This is a 'keeping Koi in an aquarium' topic.

    The context
    I kept fish as a kid with my Dad - in more or less every set-up apart from marine aquatics. As an adult with money and my own garden, I am currently in the process of planning my Japanese garden and centre-piece Koi pond. My aim is to have the pond completed by next spring.

    The idea
    I've been away from fish keeping for a long time and I'm concerned about going back in at the deep end with this pond. I have a few ideas that I'd like to test on a small-scale first: such as an edible garden bed filter, and using solar for elements of the lighting and filtration. I'd also like to raise my Koi from very small fry.

    The question

    I have recently acquired a 340 litre (75 gallon) aquarium, and I'd like to grow-on half a dozen Koi fry over the winter, with the intent of putting them into my pond when it's finished next spring. Is this a feasible idea, or am I going to permanently stunt the growth of these Koi by doing this?

    Apologies for asking this - but the internet is a minefield of opinions about this, that range from the 'it's possible if you understand the needs of Koi' to 'it's impossible, Koi are for ponds, period.'

    Should I even bother?



  2. #2
    Yes why not mate there is loads of people who will help you in your build and the fry will live happy in there I would say

    Sent from my SM-F926B using Tapatalk

  3. #3
    Welcome and don't worried we are all a family here

    Sent from my SM-F926B using Tapatalk

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  5. #4
    Senior Member Rank = Grand Champion RS2OOO's Avatar
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    Hi and welcome.

    When you say "grow on" Koi in 340 litres that obviously indicates you want to feed them reasonably heavy to get the growth.

    As you say, the vast majority of people will say no, the volume is way too small, and in some respects they are right, so, I tried it myself rasing 4 Koi in a 400 litre vat, and documented it all on this forum here:

    https://www.koiforum.uk/koi-gallery-...-pictures.html

    So, this is proof that its possible and the Koi can come out the other side a lot bigger, but the amount of maintenance and water changing was crazy.

    I was getting KH of about 14 out the tap, and feeding 6+ times a day the KH in the vat would drop to 0 within 48 hours, then by 72 hours the pH would start declining from 8.2 down into the mid 7's and I had to change water gradually enough to bring it back up and replenish the KH, but without shocking the fish too much and without impacting the growth.

    So yes, it is certainly possible, but it was a proper pain doing 50% water changes with temperature matched water almost daily so as to avoid a pH crash.

    I was running this 400 litre vat on a large pressure filter, supposedly recommended for ponds up to 15,000 litres, yet it was constantly full of muck just from the 4 fingerlings, and I was also running flow at 10,000 lph, again as an experiment since I believed high flow would increase growth rates, and it did, these Koi achieved 20cm at 23 weeks old and 32cm at 35 weeks old.

    Would I do it again? Probably not but never say never, it was good fun but took up so much time and effort.

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  7. #5
    Junior Member Rank = Fry RagePotato89's Avatar
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    Quote Originally Posted by RS2OOO View Post
    Hi and welcome.

    When you say "grow on" Koi in 340 litres that obviously indicates you want to feed them reasonably heavy to get the growth.

    As you say, the vast majority of people will say no, the volume is way too small, and in some respects they are right, so, I tried it myself rasing 4 Koi in a 400 litre vat, and documented it all on this forum here:

    https://www.koiforum.uk/koi-gallery-...-pictures.html

    So, this is proof that its possible and the Koi can come out the other side a lot bigger, but the amount of maintenance and water changing was crazy.

    I was getting KH of about 14 out the tap, and feeding 6+ times a day the KH in the vat would drop to 0 within 48 hours, then by 72 hours the pH would start declining from 8.2 down into the mid 7's and I had to change water gradually enough to bring it back up and replenish the KH, but without shocking the fish too much and without impacting the growth.

    So yes, it is certainly possible, but it was a proper pain doing 50% water changes with temperature matched water almost daily so as to avoid a pH crash.

    I was running this 400 litre vat on a large pressure filter, supposedly recommended for ponds up to 15,000 litres, yet it was constantly full of muck just from the 4 fingerlings, and I was also running flow at 10,000 lph, again as an experiment since I believed high flow would increase growth rates, and it did, these Koi achieved 20cm at 23 weeks old and 32cm at 35 weeks old.

    Would I do it again? Probably not but never say never, it was good fun but took up so much time and effort.
    Thank you for your reply and sharing your thread. This is super useful, and you've achieved some excellent results. It has given me a lot to think about.

    In terms of what I am looking to achieve, I was thinking of a more leisurely grow-on, rather than a turbo-charge. As messy as Koi are, I wasn't anticipating a water situation anything like what you describe - but I think 14 feeds-a-day somewhat explains this? I was thinking more like 4!

    Water movement is an interesting point - I was thinking a canister filter aimed at filtering 800 litres for the 340 litre aquarium, but your post is making me think that this is too conservative.

  8. #6
    Senior Member Rank = Grand Champion RS2OOO's Avatar
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    Koi produce an unbelievable amount of waste when they are growing and this becomes really noticeable in a small environment.

    For example I was keeping fancy goldfish in a 5' tank, feeding 3-4 times a day and turning water over at 2000 litres per hour with 2x canister filters. One of the filters I hardly ever cleaned out, the other I did every 6-8 Months or so, and everything was fine.

    Yet as in previous post, when it came to raising Koi the flow through the pressure filter (supposedly for a 15,000 litre pond) was notably slowed after about a week, and constantly cleaning it was a messy job. But it was not difficult.

    The difficult part was maintaining the pH and KH because in such a small volume with heavy feeding the KH was getting depleted at an incredible rate. To be fair though, whilst they are never recommended for a Koi pond, the pressure filter managed the bio side very well, albeit it was just 4 koi.

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