RedSea 260 Max E/69 gallons. 28 watt UV running slow flow
Was your experience referencing ovata species?
Thanks
You should really seek out the manual for your make and model of UV sterilizer. The actual amount of UV exposure varies between makes/model (even of the same wattage) because they are of different lengths and varying quality of quartz sleeves. To sterilize dinos, you should be targeting between 60,000-90,000 uw/cm2.
Here's an example from the Aqua Ultraviolet Classic manual. For a 25W unit, you should be targeting a flow rate between 400-600 gph. You could go less than 400gph for dinos, but make sure your particular unit doesn't have a minimum flow rate to keep the quartz sleeve and bulb cool.
UV is a great tool when used correctly. If your flow rate is not correct and too fast, your UV will be acting simply as a clarifier and not help you with your dino problem.
Edit: One other thing, you should be sure that the flow rate is enough to turn over the tank volume by at least 2.5-3x per hour. If it doesn't, that means your UV unit is undersized for your needs.
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