I've seen and heard of corys going to the water surface for atmospheric air. But it's the "sucking in lots of air thus creating lots of bubbling sounds" that puzzles me.
Mine normally just splash some water onto my face and go directly back into the bottom.
Bubbling sounds? Lack of oxygen in the water?
P-L-E-C-O-R-Y=M-A-N-I-A!!! YEAH!
FLORENCE, capital of the region of Tuscany, has a population of around half a million inhabitants, spreads on the banks of the Arno, between the Adriatic and the Tyrrhenian seas, almost in the middle of the Italian peninsula. It is a city which bustles with industry and craft, commerce and culture, art and science.
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