This isn't aquarium equipment exactly but it works great for getting to those hard to reach places, without taking your tank apart.
There are these things called grabbers that people with disabilities use. I have one to reach things that fall on the floor or roll under things.
Well one day about 8 months or so ago, I had a dead fish I couldn't reach. So I cleaned my handicapped grabber, rinsed it well and reached in and gently picked up the dead fish without disturbing a thing.
I don't loose many fish anymore since joining AA but if I do I can use my 3' grabber.
If you have a deeper tank, you can get a grabber that has an extension.
You can pick one up at most drug stores or Pharmacy.
It simple, easy, and works great.