Abstract: An adjustable aerator for fitting different sized live bait wells. The aerator includes a plate that is vertically positioned in the live bait well, a pump, and a manifold in fluid communication with the pump. The pump is attached to the base of the live bait well by suction cups and aerates water passing through the plate. The manifold conducts the water after being aerated by the pump and includes a lower elbow in fluid communication with the pump, an upright tube in fluid communication with the lower elbow, a TEE in fluid communication with the upright tube, a pair of transverse tubes in fluid communication with both sides of the TEE, respectively, and a pair of upper elbows in fluid communication with the pair of transverse tubes, respectively, and rotatably attached to the pair of transverse tubes, respectively, so as to accommodate for the different sized live bait wells.