Are you going to use the timer for hours off then hours on?
Just from what I've seen in my tank I would just caution against that. When I turn off my mp40 to clean my tank, I sometimes see my 6 line wrasse swimming around in it... I've also seen snails get into the inside of it when I leave it off for the night. I would just make sure nothing can get into it since you might not be around when it turns back on.
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