Answer!
You can pretty much fill it anywhere you like. The closer to the top, the greater the risk of overflow, but there's no reason structurally, to stop a few inches below the trim. In fact, when I put in overflows on my tanks I try to make the water level just above the bottom of the trim line because I think it looks better than seeing the waterline. Plus you get salt creep and so on above the waterline, which is unsightly.
Hope this helps..
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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