I'd reduce the light, do the high power for 3-4 hours ansd low light the rest of the time.
Do a 10 hour(total) low light and full power for 3-4 hours in the middle.
This will save on electric, bulb life, nutrient demand.
I'd highly suggest keeping the CO2 high in low light tank.
Both Claus and myself have suggested low light tanks greatly benefit from this independently.
I would suggest adding more hardscape, take your time and see what you like. That will anchor the tank's design more. Replace the fast growers with ferns, moss, Crypts etc.
The C balansae will get 24-30" long leaves.
Give it time.
Many of Amano's designs have sand in the front and stem plants in the back 1/3 of the tank and hardscape separating them.
While the nutrient routine you have is rich, you can down scale it if you reduce the light.
If 2 week water changes and pruning is your goal, try less light, plant choice changes and about 1/2 the dosing you are now doing.
You can and may perhaps want to try this also:
Reduce the amount you are now dosing till you get a negative plant response.
Then that's the min amount you need for that light level.
You can repeat this when you use less light, I'd say you would only need about 1/2 this amount and iof you fed the fish well, you 'll be okay I'd imagine.
You can watch the plants and you know what they should look like when optimal growth is occuring.
You'll see a slower growth rate, but the health should be the same if not improved.
At 1/2 the dosing, I think you'll be okay for 2 weeks, the weekly method is guessing for one week, there's no reason you cannot get away with longer time peroids as you gain experience and there is no issue with the tank(algae, poor plant growth etc).
If you screw it up, go back to doing what you did before with a water change and try again this time adding a bit more or less.
I use the plants, Mic umbrosum for NO3 and Riccia for CO2, green spot algae and pearling for PO4 etc.
Trace excesses, K+, PO4 excesses do not cause issues.
Only CO2 and NO3 at very high levels will cause issues.
Most fish waste is NO3/NH4.
So high PO4 with good CO2 is not going to cause any problems.
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