good with parasites like ich,but a uv sterilizer shoud be put on a timer for 3-4 hours a day depending on the size of the bulb in comparison to your size of tank!algae blooms are a cause of alot of things not done right in your tank, best to see where you went wrong or what you're missing
over feeding,cycling,skimmer,filtration,husbandry,light ing,temperature,live stock etc....................
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