To answer all your questions:
Yes. I would consider adding at least DIY CO2. HC thrives more in a rich co2 environment more than anything. I've grown it in low light tanks just fine as long as the co2 was good.
Yes. I would consider adding at least DIY CO2. HC thrives more in a rich co2 environment more than anything. I've grown it in low light tanks just fine as long as the co2 was good.