I like the tank - good job.
I personally belive in small incremental changes, that way you can better figure out what works and what does not. I that were my tank, this is what I would do:
2 - 3 weeks
- Add a powerhead (like Coralia) in the back right corner pointed towards the front left corner: you want gentle flow to reach the oposite side of the tank
- Clean the filter ~ once every 2 weeks
You should start seeing changes in BBA
If no substantial difference:
Deeper vacuuming of substrate, especially around the plants with BBA 2 times per week for 2 weeks
If no substantial difference:
Up your fertilization to 3 x week for 2 weeks
You should start seeing improvement in your plants
If no substantial difference:
Start adding Trace 3 x week for 2 weeks
If no substantial difference:
Increase Potassium dosage x2 and start adding Nitrogen per instructions for 2 weeks
The above recommendations are based on:
BBA = flow (even distribution of nutrients) + excess of organics
Plants = Light + nutrients + flow