As for the Dwarf Puffer I have not seen it nip at the free swimming fish. I have Cardinals and Rasboras and it leaves them alone. But have seen it nip the bottom dwellers like coryies and probably other bottom dwellers but mostly when it does not have snails to eat, like right now. Who ever wants to use it for a week or so for snail control we can make arraingments to have it picked up. Then if you want to return it at the next SCAPE meeting that will work out just fine.
The driftwook is not branchy but I will take it to the next meeting for who ever wants to look at.