I've got three dwarf puffers (bought from HFF two weeks ago - were skinny since I got them but are healthy otherwise, swimming about etc) - one is a nice size, one's on the skinny end and the other's body is pretty much concave.

I've dewormed them with something I got from the Bird Barn - however they don't know what medication it is as they get it from their supplier as "Dewormer"

He's currently eating snails and white worms - except any food goes through him! One white worm came out the other end... still alive. The skinniest is currently in a breeder net so that I can fatten him up, but I can't if food is going straight through :c

What kind of parasite medications can I get for this? Is there one I can get from HFF shipped to Tauranga?

I had two DPFs (the second I got free) from my LFS, but they were both clearly very sick in the store and wouldn't eat at all. However, the water parameters are spot on and I've done a fair amount of water changes lately.

Also, a bit off topic, but if I were to have a staple diet, what kind of worms would you guys recommend? It's hard to get nearly enough snails as a staple diet, they won't eat anything prepared (including bloodworms) - I've read whiteworms are quite fatty, so are there any other types that would work for a staple diet?

They should eat bloodworms but you might have to hold each worm in tweezers and wiggle it so it appears alive.