If it were me, I'd wait...but they mean feed your dragons chow. A lot of people wait until their combined XP bonus are at least 250% before feeding the dragons. (Upgrade altars, build as many as you can per TH level, do biome specific research to up this percent) How To Train Your Dragon <== LINK Mine is way past 250% now, but I'm patient and am in no rush, so I may just wait some more...