[fhorst]

Your setup sounds quite OK.

The sound from your pump might be that there is some air at the impeller.
Switching your pump off for a few seconds gives the air the possebility to get out from the pump.

it's a bit the same for the tiny bubbles in your loop.
Once you have your loop running, there is no place for the air to "settle down" leaving it in tiny bubbles. The small bubbles won't disapear, unless you have a place where the flow is low (usaly reservoir)
When the flow is high there also, just shut down you pump, let it "rest" for a few minutes.
You will see that the tiny bubbles will form bigger ones.

Moving your case a little, will make the bigger bubbles go to the highest point : your reservoir. At the reservoir you can let the air out by filling it.

Dangerden clear reservoir does not tell me that much, as they have several reservoirs, the round one, and bay reservoirs.

I have the round one also, and that can give quite some turbulence, but it's real easy to fill/blead, just aslong as you shut down your pump, let the air bubbles rise to the reservoir, and fill it again to the top.

Let us know how it works out!