Water Parameters

Currently, there are 5 sources of water we are using to fertilise the veges...

1. Indoor 300l community aquarium
2. Indoor 140l Betta sorority aquarium
3. Outdoor 60l Guppy pond
4. Outdoor 20l misc fish black rectangle plastic container
5. Outdoor 15l misc fish round ceramic container

The 1st 3 are the main sources. Tested the water parameters today...

The indoor aquariums looked ok.

The nitrates had a slight reading, but that's ok considering it was done just before a water change. 

The outdoor guppy pond is a revelation. The nitrates were close to zero.

I suspect a few reasons for that.

1. rain - lots of natural water changes due to heavy downpours over the last week.
2. auto filling dechlorinated tap water 4 times a day from a reservoir. With these results, now I can either reduce it to 3, or maybe redirect it altogether to water some plants. 
3. algae (manageable levels) and the floating rack of kangkung sucking up the nitrates. If this is the reason then, great!! coz that's aquaponics in action!
4. using the pond water for watering veges outside the pond. I will stop that practice now, and just let the kangkung within the pond exclusively use its nitrates.

The pH was at 8.5, higher than the recommended level for guppies, but the fish are doing really well, touchwood. I will add more indian almond and banana leaves to bring down the levels.