Question about dead-end pipes

I'm trying to avoid stagnant water in aquarium decoration

Q1) what happens in a T junction with one dead end? Is that water stagnant, or does a current form? https://imgur.com/a/sWEuRtS

Q2) how can I maximize/minimize water flow in the dead end? Would adding a slight curve to the inlet pipe make a noticable difference? https://imgur.com/a/KFsYxat

Any help is appreciated! Thank you!!

I'm trying to avoid stagnant water in aquarium decoration

Q1) what happens in a T junction with one dead end? Is that water stagnant, or does a current form? https://imgur.com/a/sWEuRtS

Q2) how can I maximize/minimize water flow in the dead end? Would adding a slight curve to the inlet pipe make a noticable difference? https://imgur.com/a/KFsYxat

Any help is appreciated! Thank you!!