06-17-2012, 01:30 PM
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I don't worry about protein surface scum. Some of my tanks never get it, others do periodically, i can even see it one week and not the next. If I see it at the water change, I invert the siphon and remove most of it.
Years ago I got surface skimmer attachments for my canisters and that was fine, except plant debris will clog it. Then i had fish getting pulled in and killed, so I removed them; couldn't be bothered with screens since the plants would clog these anyway.
As for the gourami, considering the swamps and ditches they naturally live in I can imagine they are fine.