[slief]

Originally Posted by ReefClownMIA

How long has it been running, and how old is the tank? Microbubbles are usually only an occurance during breakin, or when pump speed is too high.

To add to what Marco said, micro bubbles will also occur on a newly setup tank or in the case of a skimmer that is grossly oversized for the load. Let the skimmer break in and the micro bubbles should subside provided you have some fish in the display. If you have no fish or load in the system, there won’t be any proteins/dissolved organics to bind the bubbles together into foam. The bubbles binding together helps them rise since more bubbles bound together result in great bouncy which gets them up the neck instead of some of the bubbles getting drawn out the effluent. As such, micro bubbles from the skimmer on newly setup tanks is very common and expectable until there is sufficient load or organics in the system to allow the skimmer to operate properly.

Also, with an SM200, I would suggest running the pump betweem 28 and 32 watts as a starting point.