I've junked one of the Eheim Pro 3 2080s. Tried silicone-gluging the area that is leaking but water is still coming in from somewhere. I might not have sealed it properly since there are places very hard to get to. Waiting for my Fluval FX-6 to arrive so I can set it up and check on the other Pro 3. Over here, Fluval FX-6 is similarly priced to JBL e1501, so I went for the Fluval for its higher turnover and the neat feature of using the pump to drain water during water change.
Time to move on...