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  How Long Can Fish Go Without Food? What to Do Before a Trip

  How long can fish go without food? A weekend is safe, a week is common, two is a gamble. See what each source says and how to prep your tank for a trip.

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  Hair Algae in a Fish Tank: Why It Comes Back and How to Clear It

  Hair algae in a freshwater tank: pull it out, then fix light, feeding and heat so it stops growing back. Plus how many Amano shrimp it really takes.

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  Algae in a Fish Tank: Identify It by Color, Then Fix the Cause

  Fish tank algae, identified by color: green, brown, black or blue-green. Which types are harmless, which mean trouble, and what to fix first in your tank.

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  Ich Fish Treatment: How to Clear White Spot Disease From Your Tank

  Ich fish treatment: how to spot white spot disease, why timing matters more than the dose, and what the sources say about salt, formalin and malachite green.

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  Fin Rot in Fish: How to Spot It, What Causes It and What Treatments Exist

  Fin rot is a bacterial infection that eats away at fins. How to tell it from nipped fins, the usual causes, and where salt and antibiotics advice splits.

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  Fish Lying on the Bottom of the Tank: What It Means and What to Check First

  A fish lying on the bottom may have bad water, low oxygen or a swim bladder problem. A short triage of what to test first and what the sources say.

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  Green Water in a Fish Tank: Why It Happens and What Actually Clears It

  Green water in a fish tank is floating algae. Why it blooms, how blackouts, UV, water changes and less light compare, and what to do by tank age.

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  Pest Snails in a Fish Tank: Are They Harmful and How to Control Them

  Bladder, ramshorn and Malaysian trumpet snails are mostly harmless. What causes a population boom, and how feeding, traps, fish and assassin snails compare.

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  Fish Died in a New Tank: How to Find the Cause Before You Buy More

  Fish died in a new tank? Match when they died to the likely cause: chlorine, ammonia, nitrite, heat or stress. What to test and what to do next.

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  Fish Gasping at the Surface: What It Means and What to Do Tonight

  Fish gasping at the surface? Check the species first, then oxygen, nitrite, ammonia, heat and gills. A quick triage with sourced numbers and tonight's fix.

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  Brown Algae in a New Fish Tank: How Long It Lasts and What to Do

  Brown algae (diatoms) in a new fish tank is common. Sources disagree on how long it lasts, from a few weeks to months. Here's what to do in the meantime.

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  Cloudy Aquarium Water: What the Color Tells You and How to Fix It

  Cloudy aquarium water by color: milky white, green, brown or gray. What causes each, whether it hurts your fish, and what to do (and not do) about it.