A few days at most. Especially with the anthias. They need to feed all day long.
When my father has to go away he measures out the feedings in advance for my step mom. He puts them in little containers, tells her to defrost one a day and feed the tank. This way he knows exactly what's being fed. And how much.
I do the same...premeasure my frozen food mix, cube them, and then tell my husband how many cubes to defrost and feed to each tank. I currently have 4 saltwater tanks up and running. My Copperband butterfly needs to each everyday...just like your anthias. An established tank with pods helps.




