Is sponge a key to keep boxfish alive?

[sinhotang]

Someone told me his boxfish like to eat the sponge on the rock.So is sponge a main food to keep them alive?I find that most people cannot keep them long alive in the fish tank.

[Joke]

I have kept many boxfish in the past, great fish if you know their requirments. Most commonly seen boxfish get larger than expected and need a big tank, this could be a big reason why many stress and release toxins. Many Boxfish feed on algaes and sponges, but many will except other foods. To make their diet more natural i fed mine a mixture of dry and frozen food with the addition of a food that has sponge in it, this is ussally used for picky angelfish and butterflies.