I'm not sure what you're trying to hook it up to, but this page surely has something you can use.
Is there a sink anywhere nearby?
A simple inline connector does the trick every time.
If the wife is concerned with aesthetics, why not shift gears and get something like a Red Sea XL deluxe 425?
Yes, a bit pricier, but it's going to look better than anything you can build, and it comes with everything you need.
You can peel them off of rocks, unless they are deep in small crevices, which makes it difficult.
I've done it with an x-acto knife (or something else super sharp), just go really slow so you do not damage them.
You may want to frag outside of the tank using water from a water change.
Obviously frag on a work surface, but put it in water change water for a bit.
It will release “stuff” when cut.
You can eliminate most from your display tank with this method.
And like the other poster said, run carbon...
I'd keep it simple, move as much water as you are comfortable.
In the water you are not keeping, shake clean your rocks before putting them in water you are keeping.
Take the sand with you. Clean and put back in the tank but at a later date, lots of time later for that.
Basically, move rock...
If you are worried about that yellow stuff, shake the duncan until it retracts, take it out of the water and brush the stalk and plug clean with a toothbrush.
But, if you are overdue for a wc, could be you've just let the tank go south.
Do a deep clean, some regular water changes and see if you...