^Hmm....IDK, can you even use guano with hydro? What's the NPK ratio of the fert you're using? Yes, more will help, but you also have to worry about overdoing the other nutes. It's really hard to make that call, when I'm not there to look at 'em, myself. Do you have a veg nute? If so, alternate that in next time you feed, then switch back to what you've been doing. They burn alot of nitrogen during the initial stretch, and a little veg fert will make sure they don't yellow too early, dropping their fan leaves prematurely.