i have had him for about 3 months and this aint my first one he is in a 125 gal. marineland tank with pleanty of filtration with 2 tank mates 13'' spotted gar,baby teacup stingray both were intro. about 2 weeks ago and they had no problem at all.....the gar and aro were eating together first day but yesterday i come home and noticed my aro swimming weird and kinda in slow motion and his pupils were huge ...........................??????