Martin's 180g Reef Build

[gregzz4]

Hiya Martin. Nice build so far.
If you don't mind some constructive criticism ...
Black ABS is for Waste water and may leach some undesired stuff into your system. I'd suggest you do your best to replace it all with 200, sch 40 or sch 80 PVC. You don't want any crap causing surprises that you won't be able to figure out.

And about your Herbie, I have my main 1" pipe about 2/3 up and the Emerg 3/4" pipe just below the DT level. Same as you, I don't want too much overflow box water draining into the sump. Plus it makes for a quieter box with the level higher. And when the emerg kicks in during testing, I hear sucking in the tank long before I hear drainage noise in the sump.