I guess the wiring block is there to allow for easy rewiring of a replacement pump. I just bought a used one and the metal screws in the block have a bit of corrosion on them. Might be a good idea to keep it as far away from any salt spray as possible also.
Did you velcro the control unit to the side of your stand? The back of mine is covered with a "fuzzy" velcro pad.
I have no idea how I'm going to mount mine to the tank - no sump. They didn't include the mounts, just the rails. I'm going to try to hook up the calcium dispenser as well. Please send some good vibes my way. Good thing my sister reads German. LOL Well, it would probably help even more if they sent the instructions.
I like the way you set it up. Heard nothing but good things about them.
Can't for the life of me figure out how that cutoff float switch actually works.
BTW- It will backsiphon. Looks like you have the output hose above the water line, so you should be okay. There should be a small white clamp that screws to one of the mounting brackets to hold the waterline.