I bet it's the best $10-15 you ever spent...
I did some work on my under-tank plumbing 3 days ago ... and yesterday, mid-afternoon ... one of the fittings gave way and I hear some splashing noise. Grateful for the cold weather and I was home .... Had I been at work, would have 20+ gallons on the floor, some tripped circuits, and possibly some dead corals. Some 'higher' force is watching over our tanks.