| Just a thought
Noticed your Oxygen levels and thought they did not look quite high enough. Found in my records the saturation levels for O2 for temperature ranges, which I've copied below.
5c = 12.8 mg/ltr
10c = 11.3
15c = 10.2
20c = 9.2
25c = 8.4
30c = 7.6
35c = 7.1
Personnly I like to get loads of air into my ponds reaching these levels, especially when a new pond, as it will assist with gassing off.
Do you have additional aeration? Or is the TT providing what you currently have?
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