Hi, I bought a cobalt blue male dwarf gourami from my lfs a few weeks back, my tank has been running fine after stocking it after the fishless cycle. Yesterday after I did a 50% water change, I noticed my DG's mouth was wide open, and a few times he was laying down on his side breathing heavily. It is still like this today, he still eats and seems to act normal now, but just looks like he is uncomfortable with his mouth like this. Heres a Pic.