|| I have an established 55-gallon freshwater tank stocked with about
|| 30 Lemon Tetras, Blackskirts and Zebra Danios. A Magnum 350 and dual
|| pad filter take care of the filtration.
||
|| Recently, a rainbow-hued 'essence' has appeared on the water top. The
|| bubbles keep it pushed away, but otherwise it covers the water.
||
|| The fish aren't stressed and continue to breed, the filters are
|| cleaned, 10% water change weekly, 25% monthly.
||
|| What could this multi-hued entity be?

I think it's the protein layer??? It is part of waste produces by food,
slime coats, poop, etc... that doesn't get pulled up or out by the
filters... not harmful, although, it's said to create a barrier between
oxygen and your water, which is not a good thing... I usually try and aim a
filter outlet in some way to break up the top of the water for better gas
exchange....

Gouramis like the protein layer.. they actually eat it...

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