Cycling a tank

[TonyInVa]

I started cycling another tank on Saturday and I’m having bubbles/foam in my sump. The tank is clear and has no bubbles/foam, but for some reason the sump is full. Anybody have any suggestions?

[Jon Lazar]

The bubbles are in the sump because that's where the most vigorous air/water mixing happens.  Your overflow and sump are acting like a protein skimmer.

 

Something besides H2O and salt mix is in your water.  If it were my tank, I would drain, rinse, and refill.  Otherwise, use lots of paper towels to absorb the bubbles, or a shop vac to suck them all up.  Then run carbon.

 

Also, I would put a hose clamp on that vinyl hose in your picture, even though the line isn't under pressure.