BH 100 Skimmer troubles

Hello all this is my first post to this site. I have some troubles I hope someone may be able to help me with. I have the octopus bh 100 skimmer ithas been working fine until lastnight I shut it down to clean it up alittle and when i put it back on things dont seem right. There are tons of bubbles in the tank now it never was like this befor. So i just let it run lastnight and today nothing in the collection cup at all . The pump sounds fine but the water inside the skimmer has way more bubbles than befor man am i confused I need this thing running all my criiters look alittle stressed as of now can someone please help me out I can send pics if that would help.