Hello everyone, on my current build getting close to finish the plumbing, but ran into a question I need some help with. This 180 gallon reef ready tank has two 1 1/2 " bulkhead and pipe for drainage to the sump and 2 1" bulkhead and pipe for water return to the tanks and I need to know how tall the drain pipe (standpipe) should be in for this 1 1/2inch drain pipe.