public void runPhero() {

		Iterator<Phero> itP = pheroKDTree.keySet().iterator();
		while (itP.hasNext()) {
			Phero ph = itP.next();
			if (!ph.alive) {
				pheroKDTree.remove(ph);
			} else {
				ph.decay();
				ph.render();
			}
		}
	}