[nrstype]

Yes.. keep filtering (that is 3 votes FOR filtering so far) You'll upset the balance of the tank if you don't, and things will start dying off, reboot the cycling process and all that.

You've stated you identified the piece, or where the air is coming in from. So, if air is being introduced somewhere in the tubing of the outlet, if you know the source of the leak where the air is being let in, you can seal it with something (aquarium sealant, duct tape, something), anything to occlude the air from getting in.

I also wonder if you have anything that produces air bubbles next to the intake of the filter. Like if you have a water decoration with air, air wand, air stone, or something near the intake of the canister, those air bubbles also can be sucked into the system and expelled out. (I've had this happen before and had to move my air wand that was underneath my substrate.)

However, the brown murky stuff being spewed out in the tank is probably buildup of bacteria/debris inside of the inlet/outlet tubings. Algae usually needs a light source, so I do not believe it is algae. Every once in a while these canister tubings may need to be "snaked" with a special flexible brush to keep them clean (i'm talking every few months or so. I do mine 1 - 2 times per year on my canister).

The air bubble is acting like a scrubber as it passes through the tubing, dislodging the buildup and casting it out. So sounds like a tube cleaning may be in order at some point. Only clean one tube at a time, because you don't want to kill a lot of your bacteria all at once that is growing on those surfaces, or your system could see an ammonia elevation. I clean my intake tubing out one day, then a couple weeks later, clean the return outlet tubing. Then I'm done for about 6 - 8 months or until I see another buildup happening. This doesn't shock the system.

Good luck~