I agree. Is there any way you can replace the 10,000s with 6500Ks?
If you could bend the plant weights, they might be made out of lead. Many people use neoprene fishing line or black thread to attach plants to other things.
Can you use Seachem Flourish Comprehensive? I use it and I think I've found the right dose over the default. Also, some plants have problems going from one tank to another and turn yellow, or your water params might not be suitable for that particular plant, and it is advised to leave the parameters alone instead of doing long-term changes, and to use plants that tolerate your water well. I take that back- Discus are an exception to the rule because they have to have certain water attributes, so you may have to adjust the water and keep it adjusted every water change.
If you don't have a liquid water test kit, you're going to need it. In my price range API Master Test Kit seems pretty good.
I would personally recommend in your case working on plants first and after the tank has been well-planted, bringing in the Discus. Once the plants are in and growing well, fast-growers and to a lesser degree, slower-growers, will take in available ammonia
Please take what I've written with a grain of sand
and use what makes the most sense to you.