Don, if you are seeing them in the sump but none in the display its usually just a matter of time... What i wish I had done when i found the first couple in my Fuge was to disconnect the sump, tear it down and bleach everything before restarting it. May sound extreme but it was a good month or longer where I saw a couple pop up in the Fuge before noticing one in the display so I may have had a chance at containment/erradication.