About 250 species of subterranean fish are known on Earth, eking out a living in a world of permanent dark and scant food. They are usually small, generally a few inches long, since there’s usually ...

Before we unleash our inner artist, let's lay down the golden rules. The well-being of your aquatic companions is non-negotiable. Rule #1: The Vinegar Test. Does your chosen rock fizz when you put a ...