I have a very basic understanding of this as, but I have battled something that looks an awful lot like this and I can tell you what I did.
It's actually very simple...I focused more on helping my plants be a healthy as possible in order to out compete the algae and whatever that other gooey bacteria is. I do 10 plus hours of lighting (I try to match the natural cycles of light... however many hours of light I get from the sun I give at least that to my aquariums). I've found rooting agents like seachem flourish advance to help root growth to be quite helpful. The more roots your plants have the more nutrients they will take in. Also knowing what plants will take in the most nutrients is key. True aquatic plants that float are major eaters. They will help you in your battles! Pothos is another favorite of mine. It's not aquatic but it will grow in water for years as long as it's got nutrients, and it's great for eating the ammonia aright from the water column. The point is, if you take away things like lighting and nutrition you're not just going to hurt the growth you don't want. You will make it more difficult for all plant life. They all want and need the same thing. If you can get the plants you want to be healthy and thrive, everything else will balance out in the end. At least this has been my experience. It's also important to say that this doesn't happen overnight. It's taken months for mine to balance out completely, and there's even still some algae growth on the hardscape (which doesn't bother me)
I hope this info helps
It's actually very simple...I focused more on helping my plants be a healthy as possible in order to out compete the algae and whatever that other gooey bacteria is. I do 10 plus hours of lighting (I try to match the natural cycles of light... however many hours of light I get from the sun I give at least that to my aquariums). I've found rooting agents like seachem flourish advance to help root growth to be quite helpful. The more roots your plants have the more nutrients they will take in. Also knowing what plants will take in the most nutrients is key. True aquatic plants that float are major eaters. They will help you in your battles! Pothos is another favorite of mine. It's not aquatic but it will grow in water for years as long as it's got nutrients, and it's great for eating the ammonia aright from the water column. The point is, if you take away things like lighting and nutrition you're not just going to hurt the growth you don't want. You will make it more difficult for all plant life. They all want and need the same thing. If you can get the plants you want to be healthy and thrive, everything else will balance out in the end. At least this has been my experience. It's also important to say that this doesn't happen overnight. It's taken months for mine to balance out completely, and there's even still some algae growth on the hardscape (which doesn't bother me)
I hope this info helps