They are large enough to feed on newly hatched brine shrimp when they are released so are pretty easy to feed.
The problem I had (which is fairly common) is that the male hasn’t eaten for so long that he swallows them (or aborts) right at the last moment, or if you try to move the male to another tank he spits them out.
If your tank is fairly low flow the babies might be fine in the make shift urchin, you just need to target feed them several times a day.
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