I cycled my 120 gallon tank and 2 chamber sump (skimmer is connected outside of sump with tubes. I recently replaced the bio balls with live rock and now I have microbubbles in the display tank. I though maybe the water is dropping so far down (was packed to top with bio balls, now halfway with live rock) the foam created is going to the return pump. was thinking of buying a new sump, but because I didnt have those bubbles before its not the sump.




