Have you noticed a big growth rate difference with this batch and your last batch (from your previous tank)? These guys seem to have gotten so big so fast.
hard to say because with the last batch I wasnt paying as much attention. they were in a 65g underneath my 90 for the first year I had them, and I didn't really realize how big they really were until I moved them up into the 90. by that point they were about 14" or so give or take. too big for the 65 by that point.
I have a feeling the rate would have been fairly similar though. I just didnt have pics etc. to document it as easily.