No they wont starve because you will be feeding fish and they produce waste (Pooh) that turns into ammonia. Have you tested for nitrite yet. if the ammonia is reaching 0 you should have some nitrites. They also have little critters that eat it, in the LR. So IMO you should add this new rock and cut a piece of shrimp into about 5 pieces. Put one piece of shrimp in the tank for 3 day. after three days test for Ammonia, nitrites and nitrate. Then take the shrimp out and put another in for three days perform the same tests. You will find that even though you are producing ammonia with the shrimp your levels will go down. continue these steps until Ammonia and Nitrite are Zero. you will find your Nitrate levels will be quite high. High being larger than 10ppm. Nitrate is not as harmful to fish and Nitrite and ammonia but you want to keep the levels under 10ppm. The only way to do this is with water changes. But you don't have to worry about that until the other two levels are at 0.
J
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