I have a tiny hob filter that I got on ebay. It is for my 2 gallon jar. I would really love to make it work. The problem is that the water isn't being drawn up into the intake. And sometimes all of the water in that part of the filter (I put it there to try to start the filter) will just all of a sudden go out of the filter. It is not leaking out of the bottom (I checked!) it seems like it all of a sudden starts working but it doesn't draw up water. I can see the impeller spinning around in there. So strange. Anyone have any ideas I can try? Thanks!