ATCA HI contours overlaid on an optical image for all our HI detections, sorted according to increasing HI mass. The g-band optical images come from the Fornax Deep Survey (Iodice et al. 2016; Venhola et al. 2018; Peletier et al. 2020) for all galaxies except FCC 323, whose g-band optical image comes from the DESI Legacy Imaging Surveys, DR8 release (Dey et al. 2019). In each panel we show the 3σ column density sensitivity – values reported in the top right corner – with white colour, while cyan contours represent steps of 3ⁿ from it (n = 0, 1, 2, …). We show the PSF on the bottom-left corner of each panel, and a 5 kpc scale bar in the bottom-right corner.