-Do all plants generally require the same nutrients, or can I tailor to my specific plant needs? For instance, I've started to get hooked on crypt species, and we be ok with tailoring to their specific needs if those needs do in fact exist. If it can be tailored, does anyone have any good resources for learning more?
Plants in general, require the same nutrients. However, there are some plants that may derive their nutrients more readily from the substrate (such as your Cryptocoryne
spp.) rather than from the water column.
-Concerning co2, the general consensus I've observed seems to be that some is better than none regardless of light levels. Is there a general consensus as to liquid carbon products compared to full blown co2 injection? More specifically, does one method provide something that the other does not?
Liquid carbon products are effective at lower light levels, but is never as good as CO2 (regardless of lighting levels).