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Got an AquaUV 57w UV sterilizer from RMS not long ago. Main purpose is not to reduce risks related to protozoa (ich) & algae. But more for ridding accumulated toxins in an enclosed reef tank. These toxins come from zoanthids, chemical warfare between corals in close proximity, bioaccumulation from the self prepared fresh fish/prawn meat, aerosols from the air etc. Just worried about long term effects. According to the specs, the AquaUV unit is suitable for tanks up to 1300L. And capable of achieving 90,000 uw/cm2 with water flow rate of 4000l/hr. At these specs, the AquaUV is easily capable to eradicate protozoa when it passes through the filter. uw (micro watts) /cm2 is a measure of energy intensity. For reference, the killing dose of UV [uw/cm2]. Bacteria = 15,000 — 30,000 Algae = 22,000 — 30,000 Protozoa = 90,000 Some pics : Printed some brackets to hold the UV unit Printed a power supply bracket. Made a small slot on the lower bracket for easy PSU removal. Reinforcement tubes used at places where the hoses may kink (and restrict the flow rate). In my set up, water is fed by an Ecotech Vectra S1. Water flow rate to the AquaUV is estimated ~ 2500L/hr (rough visual guess. I don't have a flow meter). Outlet water pipe exits the AquaUV, right in front of one of the return pump via this tube adapter. The plan is the suction from the return pump pulls all the 'clean' water goes back to the display tank. Hence, an estimated 40% of the total water flow to the display tank is sterilized. I think this is good enough. UV lighting schedule. Not switched on 24/7 at this point. Plan to increase UV hours progressively. Black = Off. Blue = On Amateur Apex programming below Keen to get suggestions.