I have a HOB filter converted into a fuge, and I haven't seen any better results compared to when it was just a normal filter. I'm thinking of getting rid of it. Except, it does hold a bit of live rock that would otherwise clutter the display. So I might just turn the light off and call it good. Plus what asylum said about the alge, people forget they will have to manage that part as well if there is light spillage.
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