If Aquari-sol says it's effective for ich, I would just keep using that and see how it goes. If you don't see results in a week, then run the carbon, do a major water change, and try again with something else.
If Maracide is really Malachite Green (don't have a bottle in front of me to say for sure), then you would definitely only want to use that at half strength in treating for ich. My personal "favorite" anti-ich medicine, however, is Ich Cure, which is a Malachite Green and Formalin combo and has been 100% effective with proper use in my experience. I don't have fish that get ich very often (in 20 tanks, once every other year is about it), but so far I have had zero fatalities and everything clears up in 2 weeks.
Good luck.
P.S. What is your tank temp? Doesn't
need to be too high, but high 70's (as opposed
to low 70's) would speed the process along.
speed the process along