the black in pic #1 looks like algae, pic#2 looks like snails might be sucking the chlorophyll out of the leaves. that's my guess
Second that, I have a E. Barthii that would stick real low to the ground as if it was getting too much light, even though the tank didn't have that much light. Puzzled for me for a good few months, I started feeding it PO4 and NO3 and wow, its going straight up now.Pic 2, some of the spots look like marking s on 'Ozelot' sword. If the brown spots are slimy, it's diatoms, (very common in new tanks) . They go away with time (months, not weeks IME).
Keep in mind that swords are HEAVY feeders. They like good nutrition and flourish alone won't cut it. Flourish only provides micronutrients. You also need to be supplying Nitrogen , Potassium, and Phosphorus....and carbon.