Neptune's A3 Apex PRO Controller System and A3 Apex Jr. Controller System offer cutting-edge tech. Ensure precise dosing with the DOS Dosing and Fluid Metering System and monitor water parameters with Trident Marine Aquarium Analyzer. For water circulation, use the COR-20 DC Return Pump and wireless tech. with the MXM Mobius Wireless Module. Maintain water levels with Neptune's Auto Top-Off Kit. Watch chaeto algae bloom and balance pH with the GRO Microalgae Light. Neptune also offers accessories including Temperature probes, Optical Level Sensor (OS-1), and a Leak Detection Probe (LD-2).