Well I'm babysitting this angel for afriend until he gets his 40gallon in alittle. Right know he is in a planted 25g high tank with one Whisper 30 power filter. Before this I have seen him "yawn" and I didn't think much of it but know he is almost gasping for air. opening and closing his mouth and you can see his gills go up and down when he doing this. Is this a problem? He is acting normal and there is no sign of disease. Should I be worried? 
P.S I just fed both of them half a tropical tablet for bottom feeders. They love them, but I can see little dust stuff from the tablet he ate coming out of his gills. Could this be the reason?
Thanks in advance,
DL

P.S I just fed both of them half a tropical tablet for bottom feeders. They love them, but I can see little dust stuff from the tablet he ate coming out of his gills. Could this be the reason?
Thanks in advance,
DL