I'd be careful with too much crustacean in the diet. Eventually. Perhaps, for starters it's ok. But when it's adjusted, I'd keep the crustaceans to ~1/3 or less of the diet due to thiaminase that abounds in them. And the rest 2/3 should be somewhat diverse and contain vitamin B1, which is killed by thiaminase.
These guys like anything fleshy, so any frozen-thawed foods of aquatic and/or cold-blooded animal origin are good.
These guys like anything fleshy, so any frozen-thawed foods of aquatic and/or cold-blooded animal origin are good.