Am i doing something wrong?

[nark54321]

I have a nuvo fusion 30l tank. when i turn off my pump to feed my fish or inverts or for water changes restarting it always makes a ton a bubbles and ticks everything off in my tank. i always make sure there is water in the pump chamber but it always explodes and stirs my tank up. any way to prevent this? I'm in the middle of a water change now so asap will help thanks <3