The chief curator caqlled to indicate that the skimmer stopped producing foam action despite their attempts to adjust the control valve or the air intake venturi. Any ideas? Or better yet can any of the technically savy zoo crew stop in on the tank and see what's up. I can't make it today but i can stop by right before Nate's meet. If others who haven't seen the tank want to stop by I can be their at about 11:30am.