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You will need to add some buffer soon since if the pH gets too much lower your bio-filter may suffer. You want to make sure the pH stays above 6 and you don't want to change it suddenly.
What are your other water quality tests showing? How is your ammonia and nitrite level. If the system wasn't fully cycled up yet, that could explain fish deaths as well as your comment about changing water being more effective than filtering water. It does take time to properly cycle up a system to the point where the ammonia and nitrite stay at 0 and there is nitrate to feed the plants.
As the water temperature drops you will need to reduce feed to the fish and things may slow way down if we get lots of cold this winter but some things like the cold. Like Broccoli. Sprinkling seeds like broccoli, cabbage, kale, kohlrabi and such can provide plants to use up nitrates through the winter here in Florida.
Keep in mind that rain water is soft and won't have much in the way or minerals in it so you should be adding some lime.
Also, by changing water, you are probably actually impeding the cycling process and steeling the nutrients from your plants in the gravel beds.
I would recommend having not only pH and nitrate but also an ammonia and nitrite tests. I rarely test nitrate but I do regularly test for ammonia, nitrite and pH.
My bluegills all died to the winter temps. They don't really grow to a good plate size, but they are easy to catch. One of the local fishing docks has tons of these little guys in schools of 100's to thousands. I've seen guys throw down nets and pull them up by the hundreds. They're usually looking for a different kind of fish to use as bait and throw the rest back.
It sounds like your system is producing more nitrate than your plants want. What's your nitrate reading?
That's an excellent pH, but over what span of time did the pH drop 1 point? Do you use the partial water changes to balance the pH or do you use something to bring it up?
Hi izzy,
This is my latest video -> http://www.youtube.com/watch?v=tL6i-2iXtXs&feature=email&em...
I went to fishless cycling. I have not been monitoring PH or nitrogen for some time now, I have just been looking at the health of the plants. As the temps warm up I may start testing again. I do water changes each time it rains :-) those grow beds do pick up much water each rain. Thanks for the reply izzy!
Mart
PH at 4.5 adding some lime.. Thanks for the advice TC,
Mart
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