Greetings from San Francisco! I've been enjoying the freshwater aquarium hobby for over 10 years now and still learning. This is my first post to this site. I have a dwarf puffer named Waldo in a heavily planted 17 gallon community tank with 4 neons, 2 female swordtails, 2 female guppies, and a bushy nose. The tank has been thriving for over 6 months now and he's been happily and peacefully living there for 3 months. I feed him and his tankmates frozen bloodworms every 3 or 4 days, on occasion white mosquito larvae, and supplement his diet with small snails that I transfer over from my guppy tank. He happily gobbles up the food everytime I feed him and even takes food out of my hand. His behavior seems normal for a dwarf puffer. He explores the nooks and crannies between the plants and wood and comes up to the glass whenever he sees me. My only concern about him is that he looks so skinny. His tummy gets round after he eats but most of the time it looks kinda concave and scrawny. Is he getting enough to eat or does he have parasites? I notice he's a voracious eater but I've heard you shouldn't feed them bloodworms every day. Any help is appreciated.