Other than the multibar angel, the venustus angel, the potter's and the golden angel All the dwarf angels available usually present no problem. I only matched the temperature and keep in the small quarantine for a week. Within that period, the fish should be eating brine shrimps or mysis besides the frozen daphnia. The seaweed isn't a must.
Failure to eat is a sign of an unhealthy acquisition. Btw, a local copperband butterfly fish which I got from a guy who caught it in his cast net at the east coast, survived beautifully until it accidentally went into the overflow section. Food for thought?