I think a big factor in avoiding stress is getting the Fish use to your intervention and maintenance schedule.
I agree! I get impatient sometimes with them either while I've got the water level down or the tank is full ... and I'm trying to wipe the glass down, or pick out some ramshorn snails......I CANNOT SEE cause they are right in front of my face and by my hands. I have to shoo them away from me. LOL!