Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Disappointed

I could never get this thing to work right. I soaked it for an hour before hooking air up to it and could only get about 2 inches of it to work. I soaked it again and no improvement. I even tried poking bigger holes in it, setting it in my tank at different angles, but could never get more than 2 inches of it to work.It is not an air pump problem because now I have a 12 inch and 6 inch stone running perfectly fine off the same pump.