The National Aquarium in Baltimore’s inner harbor is home to more than 20,000 animals– in air, water and on land. So, what does it take to keep the place afloat?Hint: The staff deals with lots of poop on a daily basis. And food, of course. You’ll meet the diver who pilots the ‘Cadillac of all pressure washers,’ learn why it really is the early bird that catches the worm and hear about the diet regimen of dozens of divas that call the National Aquarium their home ... in habitats that range from coral reef to tropical rainforest.