Ok I have a 150 gallon and looking for a good UV . I would like to here from you whats good and what wattage you guys recommend. My tank is all sps with very little fish.
You would need at least 25 watt UV, the bigger the better so you can have more water going thru the UV. Are you using it for parasite or getting rid of algae? For parasite you need to run your pump slower.
Below is a guideline I found online.
UV(Watts)/ gph to Control Bacteria and Algae/ gph to control Parasites