I have had 2 Zebra loaches for about 2 months and they behaved normally. a few weeks ago my fiancee brought home some cories and an upside down catfish. I knew something was up when I saw her put the extra airstone/pump in here purse. She has "recued" fish in the past from coworkers.

Well my zebra loaches swim upside down with the UDC. I thought I was seeing things at first but I was just wondering is anyone has heard or seen this kind of thing.