Moon+ Reader: preferred serif fonts?

view story

http://www.mobileread.com – I've recently installed Moon+ Reader on my SGS3, and I'm enjoying how customizable it is. My favorite app for articles and shorter fiction is Pocket, and since I adore their article view I've been trying to replicate it in Moon+ Reader. I've come pretty close, except for the font, which I've learned is FF Yoga. The serif font in Moon+ Reader is nice but not quite the same, and I guess since FF Yoga is commercial, I can't find a copy for personal use. So I was hoping for some recommendations of serif fonts; which ones do you all like to use, or can you point me to any free ones that come cl (HowTos)