im not bashing ya or anything but what we encourage everyone to read and learn about the fish you intend to keep before you buy it..... so u dont end up with 7 dead fish ....
Blue face Angels can be tough to get eating in the beginning. Try Formula I & II, Spriulina Flake and nori. Also try Spectrum Pellets. Make sure you don't have any larger Angels as the Blue face will be easy bullied.
Also you should quarantine all your fish and not place them directly into your tank.
As for the Angel changing into adult colors, well that can take quite some time. Depending on how far along the Angel is currently, is it a fully Juv or did it start to show adult colors, it probably wouldn't fully change into the adult colors.
angels r hardly eaters n will eat almost anything once they r train to accept food in cap. but sponge(not the type on the kitchen sink:smileshould be included as part of their diet. i think they start changing after 4".
IME, blue face angels starts changing colors at much smaller size than other Pomacanthus. My fully changed adult is about 4" and started changing when it was about 3" a year ago.
im not bashing ya or anything but what we encourage everyone to read and learn about the fish you intend to keep before you buy it..... so u dont end up with 7 dead fish ....
there is a angel based sponged diet ready made food that is frozen. i feed that to all my anglels with a tounch of garlic extreme. follow qt rulz and you cant go wrong. changing colors depends on how he is in your tank. bullied for example will take longer. eating well and good water paremeters also can help but that isnt an exact science there. its a great fish. enjoy