I received a four inch puffer in the mail and it is eating mysis but not clams or mussels.I had a porcupine puffer that died from not eating the right foods.I don't want this to happen so while it is young i want to start doing it right but how if he won't chew on hard stuff.I bought a hunk of rock from pet store but not interested.Also how long should i keep food out before it spikes my nitrates.I just did a huge water change and it's perfect.

