Plumbing sizes and drainage

[gregzz4]

Good point about the overflow teeth (is it Wes ?)

My overflow box is an Aqueon Megaflow and it's supposed to handle 750GPH but I'm not seeing that. I can't say for sure what I am actually getting as my pump is not listed on the head loss calculator and I'm not ambitious enough to run my drain into a bucket for 'x' # of minutes

I was thinking the same thing Greg - 2 to 3 degrees down-slope, and Wes' mention of 1/4"/ft is covered in my setup and then some

I'll wait 'till after the holidays to see what others have to say, but I'm really leaning towards trying larger plumbing for a start