Small ELM regimes combine benign heat depostion with good confinement. A whole range of fluctuations has been observed in these regimes (also varying with the particular type of scenario run), whose role is not always clear. To understand their physics and the extrapolability to ITER, it is important to identify which of these modes are indeed sustaining the regime (e.g. giving rise to enhanced transport across the separatrix). Here we study in more detail the characteristics of a type of density fluctuation that was observed, among other phenomena, in a first set of identity experiments performed on JET.