Algae creeps in, uneaten food settles, and suddenly your crystal-clear tank looks more like a swamp. But what if you could recruit a team of aquatic janitors to help with the dirty work? Good news: ...

Goldfish are often misunderstood as low-maintenance pets when, in truth, they require much more than a bowl and a few flakes. These elegant, intelligent fish can live for more than a decade if raised ...