[Delphinus]

Haha, I totally did the opposite with my bubble magus skimmer. I took off the drain line and capped the hole. The reason being is that, while this is a great idea and is good for the reasons you outlined .. there is also now nothing to stop the skimmer from overflowing your sump empty should a snail or something get wedged into the skimmer's output.

Now it used to be pretty common to use a waste collector instead of a bottle on beckett skimmers but you don't see them used on needlewheel skimmers. The reason being though is that the cup is not sealed like they are on becketts (usually flanged and bolted, with a gasket) so that air can't escape except via the drain line. When the drain line closes (usually by a pingpong ball float in the waste collector) then the skimmer can't produce foam anymore because of the back pressure. This was one neat feature with beckett skimmers that seems to be lost with the current gen needlewheels.

Anyhow it's just something to watch out for.

I think what some people are doing nowadays is just putting a drain line on their collection bottles or buckets so that if the bottles overfills it just drains back to the tank. Yeah, gross to dump skimmate back in the tank but it beats an empty sump and a wet floor (it would get skimmed out again pretty quick after you fix the issue anyhow).