My mom has had algae problems in her guppy tanks for years. Its very dark algae and most snails and fish we've tried either wouldn't touch it, or died soon after. A week ago she got a gold algae eater, Gyrinocheilos aymorieri I believe, and the algae is gone. It looks like she bought a new tank because its so clean. And the fish is still alive too. She had to buy algae wafers for it because everything is sparkling clean. Wish we'd have tried this fish much sooner.