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plant growth and photosythesis



Hi all,
entered the world of aquaculture with both feet - heating cables, laterite,
pmdd and diy co2
plant growth has improved significantly but the question I have is about o2
production and the bubbling phenomenon.  I only the rising bubbles after a
water change lasting for 3hr max. and at times I've seen fish at the surface
as though they were o2 deprived.

4 discus + 6 neons

kh4-5
pH6.6-6.8
temp 84
nitrates 5ppm consistently even after adding more kno3 to pmdd.