As for how long they CAN starve, I have 2 Florida's. One took to the Silversides and Earthworms right away, but I figured he would, because he eats the algae wafers I throw in for the Silver Dollars. The other one only has one eye (got him that way) and he just never did take to non-live. He went five weeks. Yeah, five. And he still wouldn't eat. I'm guessing it has to do with his missing an eye... he can't trust us or something. I eventually had to go back to quarantined feeders, which still aren't safe, and, of course, the other one eats them too, because they're there. Oh well.