10-20-2011, 09:46 AM
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I'm no expert but I think the mollies are just doin' their thing in the corner of the tank. In other words, that's probably just their favorite spot, so they claimed that territory for themselves. If they were, like, trying to get oxygen (putting their mouths up at the surface of the water or slightly above it, swallowing and repeating), then you'd have a problem.
As for the Gourami, does he look bloated? Is he scratching up against things, even for a second? If not, have you noticed any other strange behavior or something off in his appearance?