Hi. I am relatively new to this hobby. I have a few questions. I totally understand that any type of fish needs stable and appropriate water parameters (temp, ph, cycled tank, etc... ). My question here is, can variability of other factors such as flow/current, noise, air pump running/not running...etc.. can variability of these factors stress the fish? Let me give an example. Tank A and tank B are identical (same fish, same decor, same filtration..etc... Tank A has filter and powerhead and air pump running 24/7. Tank B has filter running 24/7 but powerhead and air pump on a timer (occasionally on and occasionally off...) So in tank B the water movement and level of noise and bubbles/no bubbles is not constant throughout the 24 hours of the day. Will the fish in tank B be more stressed? Do fish get accustomed to a certain setup and get stressed by any change in that setup? Or can they deal with variability? I would appreciate any input. Thank you.