I just got my first fish yesterday (purple firefish) and introduced him to my QT. He immediately went to a corner of my tank and just laid on its side. I swore he was dead immediately but eventually he started swimming more over the course of a day. Weirdly though he is still on his side and swimming . I thought maybe he injured a fin or something during transfer. HOWEVER today I introduced my second fish (royal gramma) to my QT and HE TOO immediately went to the corner of my tank and just lied on its side. I don't know what's going on? This is newly mixed salt water , temp is 77-78, salinity somewhere above 1.02.