Looks good Greg, really like the cleanup process and attention to detail, very neat.
How many gph are you running to the display?
The emergency overflow pipe should be able to handle quite a bit, so i suggest bringing the water up as much as possible to the teeth, like 1/4" or even less.
On my old 120 running a Eheim 1262 full blast i had to have the main drain pipe closed about 95% with the gate valve on a 1" drain, so I don't see how a second emergency pipe can not take all the flow if something were to happen...
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