annoying ac filter

[hadarush]

i have an ac HOB filter on a 12 gallon nano reef
this filter emiting a lot of small air bubbles that come apart to small bubbles [something like 1 mm] and flying around the tank and getting stuck to the rocks coral and the glass
this situation is really annoying and i dont know what to do
i have in the filter biomax siporax smal pieces of rocks and some whole...
please help me!!

 

[hadarush]

:arrow:

 

[cjsrch]

fill the tank deeper so that the water isnt FALLING in

 

[hadarush]

i tried it, nothing change..

 

[Anonymous]

Take ahold of the impellor/uptake tube assembly and lift it up and down knocking it a little. No, I'm not nuts :lol: in a HOB, if the impellor (or uptake tube for that matter) gets air bubbles trapped in it it will produce that type of micro bubble.