I bought a iwaki pump used, it flows 2400gph. I am using it on a losed loop system only. Today it started shooting what looks like smoke out of the return. this turns out to be very timy bubbles. At first thought it could be an air leak, so i shut the pump down for a few hours to find the leak. I found no leaks. is this a sign of a seal going out? It kinda sounds like maybe a bad bearing. I've only had this pump running for a few days, and i notice a diffrence in sounds. If i leave the closed loop off this week while i'm on tdy, will my fish only be effected badly? my wife knows very little about the tank so i going to running off of luck this week. I went ahead and threw every small pump i own in the tank, but being a 10' 400g it doesn't create much flow.
please help.....