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Turn over rates and flow rates...?

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battmiceter
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Turn over rates and flow rates...?

Postby battmiceter » Fri Apr 14, 2017 9:00 am

Hi my pond is 6500 litres, I have a lot of big fish in it, 1 x 22" koi, 3 x 19" koi, 1 x 18" koi, 1 x 3ft sturgeon, 1 x 2.5ft sturgeon, and many more smaller fish, all have grown to this size in my pond.

I have a kockney koi mega max black box with alpha grog bio media in the bottom, and an 8000lph pump. I usually clean the sponges once a week in pond water.

Basically I can't feed much at the moment as the filter does not seem to be able to keep up... nitrite levels start to rise if I feed more than a small amount!

Could this be because of my high flow rate, the pond is being turned over approx 1.5 times per hour? Would it work better if I reduce the flow rate to the filter?

Thanks, Luke

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Manky Sanke
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Re: Turn over rates and flow rates...?

Postby Manky Sanke » Fri Apr 14, 2017 12:08 pm

Luke,

I'm afraid the answer is in your question, you have a lot of fish and a black box filter. Biofilter flow rates aren't as important to effective biofiltration as some used to believe. Fish don't just excrete ammonia when they are being fed, they excrete ammonia through the gills with every respiration cycle and your current media can barely keep up with their background ammonia output.

Feeding just adds more to their ammonia excretions. The ammonia bugs (nitrosomonas) are successfully converting the extra ammonia after feeding into nitrite but the nitrite bugs (nitrobacter) cannot cope with this increased amount of nitrite. You need to increase your bio filtration and the Eazypod is often recommended as the next step up but I'm not sure that an Eazypod would be able to cope significantly better if you're feeding more than 100 g per day. Perhaps someone with a similar pond situation would like to comment on whether they have a Pod and how successfully it keeps up with such a large load.

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battmiceter
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Re: Turn over rates and flow rates...?

Postby battmiceter » Sun Apr 16, 2017 1:29 pm

Hi thanks for your reply, I did suspect this was the case, so instead of replacing my filter with something huge, and costing a lot, I have bought another mega max black box, fitted it yesterday, and am running that at the same time, total cost with fittings was £397.

Hopefully this will give me the extra capacity I need to cope with my fish.

I have spread the mature bio media from the existing filter between both of them, do you still think I should use NT Labs live filter bugs to kick start the maturing of all the new media?

Another question on another subject, if you leave your UV light on when adding pond medic dechlora, is that bad?
I never normally forget but yesterday I did!

Thanks,

Luke

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Manky Sanke
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Re: Turn over rates and flow rates...?

Postby Manky Sanke » Sun Apr 16, 2017 3:31 pm

Once that has matured it will double your biofiltration and ease your problem, Luke,

Dechlorinators are almost invariably based on sodium thiosulphate and UV won't affect how it neutralises chlorine or chloramine.


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Re: Turn over rates and flow rates...?

Postby battmiceter » Sun Apr 16, 2017 5:19 pm

Oh good thanks.

I am also going to thin out my stock, all the small roach, bream, tench, grass carp, koi, mirror carp, all the small fish are going tomorrow morning.

My local fishing lake will have them, they will love it in there! (No predators in there either)

I dare not sell them to any1 in case they don't know what they are doing, and accidentally kill them, I've had them too long to do that.

I know it's the big fish that cause most of the waste but every little helps.

Thanks

Luke


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