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mel1of4 mel1of4
  • Not too shy to talk
  • Not too shy to talk
  • Joined: 12/12/2009 18:02
  • From Cumbria
  • Group: Registered Users Basic Membership
  • Posts: 33
  • Posted on: 6/6/2010 21:18
Re: plants wont grow in the pond!! #11
thanks to all for the help.
Will re pot everything add fertiliser tablets and keep an eye on the chemistry.
Let you know later how it all works out.
Tropical Tank - 215ltrs
4 Angels, 2 Rams, 4 Danios, 3 Chain Loaches
EagleC EagleC
  • Plants Adviser
  • Plants  Adviser
  • Joined: 28/3/2007 12:01
  • From Hampshire
  • Group: Registered Users
  • Posts: 8176
  • Posted on: 7/6/2010 13:14
Re: plants wont grow in the pond!! #12

mel1of4 wrote:
for the outdoor pond
Ammonia = 0
Nitrite = 0
Nitrate = 0
phosphates = 0
pH = 7.7
GH = 60
KH = 80
it seems I have 4000g of slightly soft slightly alkaline distilled water!!

whats interesting is that my tap water is pH7.0 and has 5ppm phosphates

I mentioned that I have made a nursery pond with a cattle drinker. This fills with rain and if levels demand tap water. the tests here show phospate of 1ppm (makes sense as the rain has diluted the tap water) but a pH of 8.8 !! (at least as this is the highest reading from a high range test - it could be even higher) What could have caused such alkalinity?

I attach some snaps of the sorry plants. ALso one of the whole pond which is 50% covered with PVC sheeting to reduce light. Few weeks ago the water cleared - is this because of the lack of light killed the algae - or did they use up all the phosphate then die?
If the water is this sterile what have the fish survived on? they have grown 2" over the winter without any food from me.

look forward to your comments

Sorry I've not been on in the few days but at least it looks like you've made some progress. With regards to the test results it appears that you have very little remaining nutrients in the water. The alkalinity could be explained by various chemicals entering the water, possibly leaching from the pots or washing in with rain water - off a roof, painted fence or concrete patio for example.

Tap water straight from the tap will often have temporary adjusters to get the PH close to 7.0 for drinking. Leave it 24 hours on a windowsill and then see what it is. The high phosphates in the tap water are not uncommon and will cause algae growth if left unchecked but rain water will have diluted that in the pond as you said.

I'd assume the fish are surviving on the food you add plus the odd insect that falls in. They wont be worried about the current water softness, the ph or the nutrient levels. Although if the KH or GH drop much more it could be a problem. You could probably feed them a little more as the extra waste will add to the plants nutrients. Ideally you'd want to maintain 5 or 10ppm nitrate and a trace of Phosphate.

PS. Pictures only attach 1 per post, if you want to add more that one image per post you need to use the image manager button. Resized Image