I lost a porcupine puffer :(

[minnierdz]

I just started my saltwater tank recently and I had all the water tested to make sure i could make fish additions. Over the weekend my roommate and I caught a blowfish and a pufferfish. the blowfish was tiny, about an inch long and the puffer was about an inch and a half. They seemed to settle into the tank well but this morning when i went to check on them i couldn't find the blowfish. It had gotten sucked into the canister filter tube thingy. I was pretty upset since the fish was very lively and cute and well, we were wondering what could we do to prevent this from happening. also if anyone knew where we could probably buy one in the central tx or dallas area. The petshops we've gone to don't have the blowfish or purcupine puffers (are they the same thing?)