One recommendation: You should put up a link to the guest's website. I saw it briefly mentioned toward the end of your program, but it's not easily accessible as you don't have it as a link. Some things to consider in keeping puffers that are NOT mentioned in your program. 1) Although they can often live for years, some species also grow very large, as in the large species shown in the beginning of your program. It is NOT recommended for casual fishkeepers to keep such big species, as you will need a very big fish tank once they grow older/bigger (up to 200 gallons or 800 liters). 2) As your guest mentioned, it's a good idea to feed the puffer a VARIETY of different foods. Puffers in general don't eat pellets, so they're actually not that easy to keep. Because their teeth continue to grow throughout their lives, you'll also need to give them HARD foods such as shelled shrimp or mollusks to file down their teeth. Otherwise, over time their teeth will grow too long and prevent them from eating, and they'll eventually starve to death. 3) Puffers are very MESSY eaters, and they eat and poop a lot. So your tank will need a very high power FILTRATION system, otherwise the water will be polluted very quickly and the fish will suffer. You can also choose to change water every few days if you don't have a strong filtration system, but most fish keepers eventually become somewhat lazy and soon grow tired of doing that. 4) Make sure you deal with salinity. As your guest points out, a lot of "freshwater" puffers actually live in brackish (water with some level of salinity) environment naturally, so they're not really freshwater. Species such as the green spotted puffer or figure 8 puffers (very popular, but not shown in your program) when they grow older need salt in the water. Do some research and invest in some equipment to measure and prepare saltwater if you want to keep those species. Puffers are great fish with interesting individual personalities, but require considerable amount of care and research, so are NOT recommended for beginners, or anyone who doesn't have the right setup. With a few exceptions (unless they're baby fish or the Indian dwarf pea puffers), you should not keep puffers in any tank smaller than 30 gallons (120 liters). Some puffers such as the giant African mbu puffers, as I pointed out above, need a HUGE tank that is not feasible for the average fishkeeper. I know their cuteness factor can overwhelm people into an impulse purchase, but it's sad when the puffer becomes depressed (you can easily tell--it is inactive, doesn't move, looks at you sadly--most fish don't do that!) after you take it home and soon afterwards, dies from improper environment (which leads to disease) or poor diet. Puffer owners will tell you that their fish very quickly learn to get very excited when food is nearby (I had one Valentini sharpnose puffer (marine) that would do a backwards dance at the surface like the Flipper dolphin in the old TV show!), and you can train them to take food from your fingers (careful--their sharp teeth could get you) or tweezers, and they're even known to recognize their owners--rare traits in fish.