How exactly the seeds of supermassive black holes formed is still unknown. Observations of small black holes in low-mass galaxies hold important clues to the answer of seed formation. However, small black holes are difficult to find particularly in low-mass galaxies where star formation tends to wash out the ionizational fingerprints of accreting black holes. We circumvent the problem using accretion variability recorded by the highly sensitive multi-epoch imaging from the Dark Energy Survey. Stay tuned for more updates!