I got a brand new filter for my new set up and I can't seem to get it to pump water. I spent hours trying to get it to work. Anyone else have this issue with this brand? It sounds like it's trying to work but nothing comes out. I've tried putting more water in the top 20 times. Tried pulling the intake tube up and down like I've read online. Nothing works. It doesn't even feel like it's sucking anything when I put my hand near the intake.