Hmmm...great most asked questions about Dats.
I think they grow slow, but I have my 5" in my 330 and bought it last month, but now it looks more like 6". I feed mine beefheart, that is pure meat. Instant protein, sorta like steroids. But not all of them eat it. I paid $100.00 for the 5" pulchers at a LFS here, and then I got a 10" one for $***.**, and also the one I got from Wes(fugupuff) at 12" for $***.**. Prices are hidden per the sellers request.
If you could get them to eat beefheart, they will grow fast. I am trying to get all of them to eat beefheart. So far, only 4 out of the 12 I have are eating meat. The rest are live feeders, and dried krill.