Willi,
I concur.
One thing... "read the water" when casting upstream. Calculate how fast the
nymph will sink in the given flow condition.
Guy

There's LOTS of ways of nymphing but USUALLY when you're fishing with an
indicator and weight you want to get your nymph dead drifting along the
bottom. That means that the distance between your indicator has to be
greater than the water depth (unless you're using an indicator that
gets submerged which can be a good tactic). There's a balance that you
try and strike among a variety of things - water depth, current speed,
amount of weight, distance between your fly and the indicator, thickness
of your leader, etc. So that means that there are a variety of ways to
get your nymph drifting along the bottom. For example if you want your
nymph drifting deeper, you can add more weight or lengthen the
distance between the indicator and fly or go with a lighter tippet or
make a longer cast or..... You got a good range of responses from a
range of people. All the advice you've gotten is good, even though it
may seem contradictory. There is more than one way to gut a rat.

The way I do it is a bit different from what the other people have
brought up. I don't like to fling a bunch of weight, so I try and set up
my rig so that I can get my flies to the bottom with as little weight as
possible. When indicator nymphing I use LONG tippets often up to 6 feet,
sometimes more. This thinner material sinks MUCH easier than the thick
sections at the butt of a leader, allows a more natural drift, makes for
better contact with the drifting nymph and also makes it easier to
detect strikes. I also believe that only on part(s) of any drift will
your fly be dead drifting along the bottom. I try and gauge the length
of my cast so the fly is most likely to be dead drifting when it reaches
the area that I think is most likely to hold a fish.

Willi