bug in tank

bug in tank

Observation - bug in tank - UK and Ireland. Description: I found these small bugs jumping around the top of my tropical fish tank last night, they are extremely small, 1mm or less. Can anyone help identify this and is it going to cause me trouble within my tank? Many thanks

I found these small bugs jumping around the top of my tropical fish tank last night, they are extremely small, 1mm or less. Can anyone help identify this and is it going to cause me trouble within my tank? Many thanks