Wait, do you mean that you haven't bought hay cubes yet, or that you haven't bought any hay at all yet? Hay is VERY important to a rabbit's diet. Flemish actually do better with a mostly hay diet, and only a small amount of pellets. In my own experience, Flemish gain fat more easily than other breeds of rabbit, because they are so calm, sometimeseven somewhat inactive. And you are right, a flabby Flemish does not look good on a show table, I have seen pickier judges disquailify for that.