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Mini Heated Pond

Bit of Sun on the Pond today interesting to see that the heating has only been on for an hour in the last 24. pH tends to rise slightly as well.
Temp-pH.JPG
 
I always thought that the pH level reduced when temperature rises. I get the opposite in the Pond. Wondering what other factors are involved. I’m thinking Sunlight and the increase in plant growth may contribute to my rise in pH with temperature increase. Any ideas ?
 
I always thought that the pH level reduced when temperature rises. I get the opposite in the Pond. Wondering what other factors are involved. I’m thinking Sunlight and the increase in plant growth may contribute to my rise in pH with temperature increase. Any ideas ?

Yes its plant metabolisme, warmer and more light will encreasy CO² uptake during the light cycle. I don't have a heated pond but during the summer months in the sun, temps can rise drasticaly and i see plants pearl like mad. Pretty normal to measure 0.5 to 1 unit pH difference between night and day..

That's aslo why its common practice to always measure pH in the morning and in the later afternoon. To get an average pH profile.. Morning is lowest late afternoon is highest. It's in the CO² equilibrium.. Ofcourse mind warmer also gasses out more CO² and water takes less up from the atmosphere..
 
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Hi all,
Yes its plant metabolisme, warmer and more light will encreasy CO² uptake during the light cycle. I don't have a heated pond but during the summer months in the sun, temps can rise drasticaly and i see plants pearl like mad.
I always thought that the pH level reduced when temperature rises. I get the opposite in the Pond.
Yes it isn't really the temperature, it is changes in the CO2/O2 ratio during photosynthesis when the sun is shining, and sun-shine also increases the temperature. Oxygen is a base (it is really O-H) so when the sun shines CO2 is depleted (so you have less carbonic acid (H2CO3)) and oxygen levels rise, giving you a rise in pH.

There are some figures in <"TDS and ....">, and some actual measured values for a planted aquarium in <"maxing CO2 in low...">, where this graph came from

5cxa-jpg.jpg

There is a slight difference in the <"solubility curves"> (with increasing temperature) for CO2 and O2, but don't think they are different enough for this to matter (but I don't actually know).

cheers Darrel
 
I experience most (sub) tropical plants prefer water temperature above 20°C before they start with any good growth. Bellow it they are more surviving than thriving. Thus i reconed, depending on plant sp. growing in the heated pond sun shine + higher temp also results in even higher plant metabolism and even more CO² depletion. :)

For example in the winter i keep Hydrocleyes alive in the cellar, under 100 watt LED light but the water doesn't get warmer than 15°C. And it is indeed only surviving instead of growing. Comparing this with the same plant in a much warmer indoor tropical aqaurium with much less light grows faster and even flowers.
 
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The pond has now been up and running for nearly four years. I have attached a few stills from a video I took yesterday. Plants are now growing more rapidly due to the increase in daylight. Have to start thinning them out. The fish seem to enjoy the environment though.
 

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Looks great. I am surprised how effective the insulation is against heat loss in winter, like other posters I was expecting heating costs to be astronomical!

What is the current fish stock? Looks like different species in new photo's compared to original stocking mentioned in first post.
 
Originally there were Rainbow Shiner, Red Shiner and White Cloud Mountain Minnows, The Shiner are short lived and numbers gradually diminished. I think there are 2 or 3 left. There are still quite a few White Clouds remaining.
I have a 270 litre aquarium which I converted to a Tanganyikan tank so I relocated some of the original inhabitants from there. These included Diamond Tetras, Pentazona Barbs and a Bristlenose.
Added some Golden Barbs and Odessa Barbs about 18 months ago. They are still going strong.
I have recently added some livebearers Swordtails mainly and a few Endlers Guppies.
In terms of invertebrates there is a colony of Cherry Shrimp, Amano Shrimp and a few Nerites.
One thing I have noticed is the difference in behaviour of the fish in the pond in comparison to aquarium residents. They tend to be more ‘lively’ and aware of their environment than their indoor counterparts.
They seem to grow more rapidly and their colours are more intense.
Probably due to the extra live food (insects etc.) they have available to them.
I've attached a few more stills containing Barbs and a solitary Shiner.
 

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Here’s a few pictures of the Pond inhabitants / plants I have taken recently. Plants are now starting to grow rapidly with the increase in daylight etc.
 

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Few pictures of the Nymphaea Lotus flowering in the Pond.
 

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