some people are successful with the small hippo tangs that are available, sounds like you are one. personally, I don't feel like they are a great bet. you really will need to upgrade pretty quickly. my brother-in-law had a tiny hippo, it got to over 6 inches in a little over a year.
my lfs has a small lieutenant tang, they have had it for months and it is healthy but has grown very slowly. IME mimic tangs are fairly slow growers as well, and do pretty well even at 2 inches if the specimen is healthy.
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