Actually, I'm not sure either plant is truly aquatic. I know the green and white one in the background is a Dracena which is definitely terrestrial.
Seachem will answer any question you have about their products. I use Seachem Flourish Comprehensive in a tank with two Vampire Shrimp, a Sakura or two and several CPO. I do not use Seachem Flourish Phosphorus.
When adding new products I always dose half and gradually increase. However, if I were worried, I'd just replace plants instead of taking a chance.