maxijet 900

OK I have a new (3 months) maxijet 900 since I put it in the new tank and about every 1-2mins it blows lil bubbles? is this normal I really didn't notice it when it was in the other tank? It eventually will be the pump I use for the GFO reactor and I will get another K2 for the display but the bubbles are annoying...
 
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