your sharks will grow faster and bigger than you think. My baby bought in July at 1" is now 8"and my others are 25" @15+ years and 17" @ 4 years. Just look at my avatar!
WOW!!!I bought my 2 sharks at about an inch in Jan,they are both now about3.5 inches,i got the barbs at the same time and same size and are about 3 inches,so the sharks have grown about a half an inch more in the same amount of time.I love Irr.sharks,i think that they are 1 of the coolest fish around!!
Definitely the ID sharks...our two are around 5 years old and about 30" - 36"...and never ending eaters...lol (not the brightest fish in the sea, though! LOL)