That's a really neat idea! Think I'm a long way off having any tanks specially for this purpose yet one day maybe! They all look very happy, how old are they in the video?
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Update, with the experiment of adding 6 various sizes of opae ula from few months old to adult to the Alpha tank to see if they get eaten - the opae ula are still alive and well.
You can see the 2nd smallest one at the 1:06 mark, top left.
Why wouldn't the Opae Ula share his food? Because he was a little shellfish