you're pretty much screwed wrt to pic 1
that's black BEARD algae, and the way to remove it is through . . . proper water management
this is a telltale sign that something is seriously wrong with your tank, organics-wise
you probably feed quite a bit or have something rotting in the tank, plant material or etc
these coupled with the increased fert could have triggered this
cut off all affected leaves, clean out the filter and change water regularly
oh, and cross your fingers
as for pic 2, it appears to be a cryptocoryne spp., if i'm not wrong
it's a slow growing plant and thus becomes a very attractive target for algae
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