I think it looks lovely! If I'm not mistaken, I believe there's a bubble wand shooting a curtain of air bubbles up the back wall of the tank; that's probably why you think it looks 'foggy' - I think it's the motion of the bubbles in the water that create the smokey effect.
he didnt have a fight in my tank but acroding to my lfs he was handed back in because he was having his fins nipped in another owners tank so i took him on im glad
yeah it is a water bubble thingy think it looks quit cool did have a smaller airstone, but got rid an went for bigger.... when ur sat watchin it it looks like an upside down water fall, v calming and the mollies like it lmao