increase co2. 2nd picture looks like black beard algae?
in my experience plants do better with 2-4bps.
i think hc is high demanding on light...never seen it grow well in low light tanks...but maybe thats just me.
i cant realy help you on the HC part as i am also a failure at trying to grow it. im currently doing 3wpg with like 4-5bps and i still cant grow it. no algae problems tho, other plants are thriving.
good luck with it
hope someone can help you.