Coral larval settlement and recruitment are crucial biological processes on coral reefs that play a critical role in the recovery of degraded reef sites. The presence of crustose coralline algae (CCA) has long been recognized as an inducer of coral settlement. Recently, the release of dissolved organic carbons (DOC’s) from CCA has been identified as the first step in larval recognition of suitable settlement substrate. DOC signatures and concentrations are unique amongst reef primary produces as well as between reef habitats and open ocean. We theorize that these differences could aid coral larvae navigation to reef sites. We utilized particle imagery velocimetry (PIV) on competent Acropora millipora larvae to capture flow field responses to varying concentrations and different factions of exuded CCA DOC’s to identify critical thresholds and specific attractants. We found five unique flow patterns displayed by coral larvae and high concentrations of DOC significantly reduced ciliary flow velocities. There were also changes in flow patterns between faction treatments. The results shine a light on the potential sensing capabilities of coral larvae for dispersal purposes. Incorporation of stratified flow will help understand how vertical positioning within the water column could be influenced by DOC concentrations and therefore dispersal potential.