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Setup an a fluval fx4 yesterday. The intake appears to be working. I thought it would be bit more powerful. Does it take a while to get broken in? What are your experiences with fluval fx4?
All the stock media/pad that came with the fluval. Two trays of biomedia, 4 sponges, and the two pads.Might have a ton of air inside possibly causing your issue? What type and how much media are you running?