Surprising O2 saturation levels

[Mortie31]

no 90% is about norm - will sit a little lower as in the start of the graph if i haven't blown it clean for a while

I've never seen it over 95%

I assume everything is healthy in your tank...Interesting you don’t get the same daily swings like I do.

 

[Mortie31]

2una, our of interest how does you ph fluctuate during a day, mine corresponds pretty well to my O2, I have no idea what this means... or if it’s significant.

 

[Mortie31]

double post

 

[2una]

saved this awhile back - not as definite a relationship as yours there

I would guess its photosynthesis related maybe? With lights on co2 consumption & 02 respiration?.
Co2 consumption leading to the ph rising / o2 respiration leading to that rising also perhaps.