Remora stopped working

[yeahcheetah]

I originally had a Remora in my sump and worked fine. Then I figured for a 50G tank I may need a bit more skimming so I added another Remora on the display tank. Now the one sitting on the display tank is skimming normally but the one in sump is not pushing any bubble into the cup. Both skimmers are cleaned just recently, MJ1200 are working fine. What could be wrong? Help me, fellas.

 

[ZANYMASTER]

Maybe over skimming it?Leave the the one in the sump running.I have the urchin in the sump for my 90 and it does fine.

 

[NYreefNoob]

agreed. turn top one off and see if bottom one starts skimming again