so i picked up a baby black diamond about 4 days ago. i had him in my moms hexagon. probably a 10 gallon or so. hes not scared of me. or when i tap the glass. swims freely. i put him with three small african cichlids. and he killed off one the first night. and took the other twos tails. yesterday i bought a new tank. didnt set it up yet. did a water change. and the filter on my moms hex broke. so i paniced and threw him in the brand new tank. i put some of the old water and the old filter pad in the new filter and he seems fine. ate about 6 guppies so far and killed another african cichlid. does this mean this tank change and two water changes didnt phase him? he seems fine but who knows. would like some input from more experienced rhom keeprs.