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You dont use the steriliser solely to control diseases, you use it to reduce the amount of pathogens in the tank, thus reducing the potential for disease.You shouldnt need a uv steriliser to control diseases.
If you have adisease there must be an explaination why it's occurred.
Typically bad water conditions, over stocking, adding new fish.
Have you dont either of them recently?
Treatment with meds usually works, and costs a lot less!
UV sterilisers are usefull when keeping species which cannot be treated with standard aquarium medications like stingrays, mormyrids, knife fishes and pirahna species as they destroy parasites before they can become a problem. With more normal freshwater aquarium fish they are more of a luxury item like air con in a car, you dont "need" it but if you can afford it then its a nice thing to have. They are quite expensive to run power wise and the bulbs need replacing every 6 months religiously or it will be doing absolutely nothing, you also have to regularly clean the quartz tube that the bulb is housed in and make sure all the pipework is clean and free of blockages.