How are my dwarf puffers growing?

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AC Members
Jan 24, 2009
Happy Monday!

I got some dwarf puffers ~2 weeks ago and they refuse to eat. I have fed them all the goodies. Even blood worms with garlic and tiny snails.

What they WILL eat is random objects in my aquarium. I constantly see them pecking at my sponge filter and driftwood even though there is no food on either. I thought I'd be tricky so I put some blood worms on the sponge filter but they won't eat those. They just eat what appears to be nothing.

Yet, they are growing and pooping. What on earth are they eating? Should I be worried? How do I get them to eat?