I moved several fish around so Felix the Oscar could move into my big tank, as he is now fully 12” long and just too big for the 75gal. He is in a 125 gal which is part of a 240 gal cascade system. (Actual water capacity running is 215 gals.)
He suffered a couple minor scrapes, & he quit eating and just did not acclimate well at first.
You can see inflammation about the sensory pits and some fin rot. A dose of nox-ich and two water changes later he is eating, doing well, and seems happy.
My La-z-Boy is right next to the 125, so we spend more time together now.