Hope someone can give me some advice here I'm new here, Is it mandatory to use a UV light if I'm doing a white tank treatment with 2 set of light, one is T5 dolphin brand and another is T8 aquazonic white. The reason asked is due to the algae bloom. Another question, will UV light affect the development of arowana ( i.e the shine, colour etc. ). I'm currently using OHF and I'm putting the UV light at the lowest compartment.