DON'T PUT A PUFFER INTO YOUR TANK UNTIL IT HAS FULLY CYCLED, ABOUT 3 TO 4 WEEKS. TEST YOUR WATER TO MAKE SURE. FIRST THE AMONIA WILL RISE, THEN LOWER AS THE NITRITES RISE, THEN LOWER AS THE NITRATS RISE. I LIKE A POCUPINE PUFFER THE BEST BUT MIGHT OUT GROW YOUR TANK. AS FAR AS FOOD, DON'T GET ATTACTHED TO THE DAMSELS, THEIR LUNCH. PUFFERS ARE HARDY, MINE SERVIVED THE LAST HALF OF THE TANK CYCLE. YAH, I GOT IN TOO BIG OF A HURRY. HE SEEMS TO REGAGNIZE ME. AT FEEDING TIME, HE DANCES ACROSS THE TOP OF THE WATER. THEY LIKE MEATY FOODS, FEEDER FISH, SHRIMP, FINGERS, ANYTHING THAT WILL FIT IN HIS MOUTH. THEY WILL ALSO EAT INVERTS AND CORAL. BE SURE TO CHECK THE COMPATIBILITY CHART ON THIS SITE.