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I was told I had to put the uvb inside the tank, is that not correct?

Can someone tell me what size uvb I need for a 50 gallon 36x18x18

Can someone tell me the difference between using the uvb tube and the uvb bulb that you put into the dome? I’m being told I have to use the uvb tube as the bulb isn’t good. But then hearing it’s fine. Can someone tell me please