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This looks to be a fairly standard AC fan 80 x 25 mm. I found an article about how to replace these and what to replace it with here
https://atlantareefclub.org/forums/topic/nova-extreme-pro-fan-and-moonlight-mod/
Reading the article, it looks like he is replacing the AC fan with a DC fan using a somewhat complicated strategy. You can simply buy an AC fan that replaces yours.
If you don't mind changing to a DC fan you can easily find one that moves more air and can have the speed controlled. I like Noctua IP65 or IP67 fans for this. They are quiet, water resistant and durable. You would need to wire it to an AC/DC wall wart instead of the standard connectors in the light, though.

