To weigh in on the thread requires some confession on my part.
Eight years ago my school of balas died in a tank crash and I foolishly bought a trio of ID sharks to replace them in my 150.
Two died fairly soon thereafter but the third lived in the 150 for six years and never exceeded four or five inches.
Two years ago I upgraded to a 450 and he hit a growth spurt and grew another five inches in a year. This past year he has only grown an inch or so.
I appear to have gotten lucky and have a runt.
Eight years ago my school of balas died in a tank crash and I foolishly bought a trio of ID sharks to replace them in my 150.
Two died fairly soon thereafter but the third lived in the 150 for six years and never exceeded four or five inches.
Two years ago I upgraded to a 450 and he hit a growth spurt and grew another five inches in a year. This past year he has only grown an inch or so.
I appear to have gotten lucky and have a runt.