I would not advise putting a smaller gonodactylid in the same tank as an Ol scyllarus. Peacocks are remarkably fast for their size and I have watched them run down and kill 5 cm Gonodactylus. You might be able to get away with adding a small (3 cm) Haptosquilla that rarely leave their cavity but even that is a risk.
Large male O. scyllarus often will not use their raptorial appendages for a couple of weeks after molting. Are the rapts sprung (extended)?
Roy
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