1 is all you would need and has enough par to grow any plant available to us. CO2 would be the only limiting factor.
My PC monitors are trash for editing and sorry the the pictures are so dark. But I assure you, my tank looks a fruit market at high noon on a clear blue sky day.
The weak point on the WA is they are fan cooled and is a failure point of the light.
Never used or seen Ledstar, but have WeakAqua P's. They look to be both similar in spectrum and WA can pump quite a bit of par. WA is more popular and is catching on fast in the upper end of planted tanks. Here's my AGA shot under WA and a few recent shots with different exposures.
I agree with @gjcarew, this sounds like a toxin was introduced. I know here, in the winter, they increase chlorine dosing. I can smell it from the faucet and it irritates my eyes in the shower.
Looks amazing, both plants and fish. I’m pretty sure I’m giving up on my AWF, it just gets lost in the other plants and keeping it smaller in front seems like a pain.
Um why? You’re over thinking this.
I’m doubting this. Fish aren’t stupid, they would swim away.
Think about any body of water and I bet the temperature varies significantly at various depths. I doubt any fish dies be cause they swam deeper and water temperature changed by 7 or 8 degrees.
Used a better camera here. I really need to practice more with it. Again, I have plants in random places trying to work certain areas at a time. So disregard the obvious issues.
I agree with @Tony shere, unless you are wanting to go down the rabbit hole, doing more frequent water change will keep you plenty stable. If you do want to increase KH, using K2CO3 (potassium carbonate) is the way to go in planted tanks.