they can grow fast got mine few months ago at around 1 inch and has grown a good inch or so friend had his grow 5 inches in two years you just never know, but eventually your 72 will be to small in about a year or two.
I bought a pair, both about 1", for my 150 reef tank about 3-4 months ago and they've shot up to over 3" in size in this time. Feed them lots of green stuff, nori, spirulina etc.
They like green stuff, but they are primarily omnivores so they need meaty foods as well. One to 1.5 inches per year has been my experience. Mine never really got bigger than 6-7 inches total length however.
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