Hello Jim,
I would love to help you but im a bit far away, best i can give is some advice:
Likely they are from an intake of one of your pumps.
There are a few ways you can check and correct this.
There should be a union on this intake, with a valve located on the opposite side of it.
If that is the case, soak a cloth in water and wrap the intake tightly and the first teflon seal.
Then check the outputs with your halides on, you should not see it spitting out bubbles anymore....until it sucks most of the water from the cloth out and takes air again.
If it did temporarily stop, shut the pump down and loosen the union and give the valve a turn, and retighten the union....
and repeat the test above.
If this doesnt fix it, re do the teflon portion of that intake...using 7 wraps of teflon, hand tighten, and 1 extra full turn with a pipe or strap wrench.
**If the pump you are using is one of the new sequence "reeflo" or "valueflo" series, only Handtighten ! as they come equipped with a "value impeller housing"
If i can help further, pm me and we can try a few other possibilities.
Marc.