I have a pond that is very well established, possibly 10yrs plus old. It is about 7ft x 4ft kidley ish shape maybe apx 3ft deep in the middle. I have a mix of Koi and Orfe one tench and some gold fish.
I use a 7 stage gravity filter Blagden I think, with a good flow of water ie a sufficient pump.
I keep coming home to dead fish so far about 4 big gold fish and one which seemed to be healthy Kio.
Two of the gold fish looked a bit fat and struggled to stay away from the surface and they have been this way for a long long time, but all the others seemed to be fine.
I have notice a lot of the fish seem to not be to active , ie resting at the bottom of the pond some of the time in the shallows.
The water is very clear crystal , ie can see the bottom of the pond.
Obviously I am concerned that I may loose some of my bigger specimens , the Koi and the Orfe.
Any advice would be appreciated?

Hi do you have an oxygenator in your pond it could be the fish are not getting enough air

Thankyou for your reply Ozzy. The lack of oxygen was my first thought because of the warmer weather we were experiencing, however I now understand the problem. I thought if I were to leave half the filter alone( so to have sufficient good bacteria to establish the filter) but wash the other half and with the warm weather the sponges would be dry when I place them back into the filter all would be good.
Well even though the water was perfectly clear , upon checking my water chemistry, the water was fish killing water , high in Nitrite and ammonia.
Partial water changes done and some good bacteria place into the filter and pond water to establish the eco system back to normal and all is good and healthy.We live and learn.

hi can anyone please tell me what i will need to to to my pond as the lillys are still in flower and its september should i wait until the flower goes nd general help getting it ready for winter and when do i need to start feeding wheat germ many thanks


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I have replied to the new thread Billy :)

thank you , what age do gold fish breed any idea and do u keep ur pump on during winter months , and any other tips you might have to improve a pond cheers

Billy1

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hi all my pond pump as just broke ive had it for 6 years running day and night so its lasted it was a superfish eco 5000, my pond is say 7ft x 4 ft x 3 ft and the pump was ok in the watts only being 60 watts but now its come to the end im looking for a new pump any advise or should i buy the same one there 85.00 new and how long will my goldfish be ok with out it as there on the top ? asap advise please

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