I have a problem with yellowing in my 25gal 18” cube aquarium.
I have Co2, hang on filter and 80gal/per hour water pump close to surface working 15 mins/per hour during photosynthetic period for surface movement.
I use seachem flourish and tropica premium for fert as its suggested on labels. I dose 1 week with tropica and next week with seachem.
I have been changing 1/3rd of the water every week and as well as trimming.
I run 2 nicrew 18” led lights with timer, kicks in around 09:00 to 9:00 first and last 2 hrs with 5 percent. Light levels automatically increases and decreases.
Is there anyone have an idea what would be causing this?