Agree, mine had a couple yellow leaves due to underwatering. Luckily I quickly corrected and it is still blooming.I don’t mean to state the obvious but my leaves turn yellow when they are over or under watered.
If it is not this… Perhaps at some other underlying issue but this is most common.
Haha the aquarium is lovely, the gardenia....i digress.
High tech in this context means CO2 injection and fancy led light.I just get the feeling you are too concerned about stuff that might not matter.
It will be lovely again as soon as you remove those ugly fu@king yellow leaves!
Without meaning to offend, a "high-tech" planted aquarium, sounds disturbingly backwards.
Since there are few lifeforms less high-tech than plants in water. That's what... The second, maybe third formation of life?
So "high-tech" just reads as "trying to sell some shit" to me.
Less is more. Mostly in our minds.
I'm concerned because gardenia is one of the most beautiful things I've ever witnessed. I think.
So what would you recommend? A repot where i clean out most of the old soil?