Thanks for the pictures. Very nice!
Can you please tell me why do you need solenoid right after CO2 regulator? and one on the water filter line?
Do you shut the CO2 injection at night?
I see that you have your fish tank facing directly to the window, I think if you move it from direct sunlight, you can elemenate that UV sterilizers.
Sometime ago I use to have a tank facing window, about 10- 15' away, plants was nice and green, no CO2, nothing!!! Just WC, and air stone ... I had so much plants that I was pulling them out and trowing it to the trash.
But my problem that time was green long algae! It was so many that fish was getting caught in it ... and time to time water was turning green. All that was gone, as soon as I move my tank away from sunlight, but then plant's was not as green
With current 7 Gal tank I have different type of algae, it's more like an dark green ink on the limestone on the gravel, and looks like a velvet on the big leaves and some parts of java moss. It must be a light or lack of CO2...
Because fish feels fine, all 8 in good shape and breading like crazy (fancy guppy and corydoras).