Sea Slug Sea slugs are mollusks, related to the shelled terrestrial snails that we are all too familiar with on land. They are distributed everywhere in both tropical and temperate seas, with the greatest numbers and the largest kinds found in...

Bettas! The variety in color and finnage available in domestic strains of Betta splendens is truly astounding, as the beautiful male on this month’s cover reminds us, but there is an equally diverse variety among the many wild bettas—the other...

During the months of November and December 2009 one lucky TFH Twitter follower will win their choice of Dr. Axelrod’s Atlas of Freshwater Aquarium Fishes or Dr. Burgess’s Atlas of Marine Aquarium Fishes courtesy of T.F.H. Publications—an up to...

Gracing our shiny year-end cover this month is a group of Pacific sea nettles Chrysaora fuscescens featured in the “Jellies Invasion” exhibit at the National Aquarium in Baltimore. Found mostly off the West Coast of the United States, these...

Live Sand (”LS”) is essentially a combination of non-living substrate with a myriad of tiny beneficial life forms that grows on it. It is home to many microscopic biological bacteria. LS can form as a main base for biological filtration in a marine...