Fish care guides
These guides start with a recent event or care decision. For a visible symptom, start with the symptom library.
If fish suddenly gasp, become weak, or die after maintenance, the timing is an important clue. It does not prove that the water change itself caused the problem. Work through everything that changed, starting with the fish still alive.
Read guide →Early losses in a newly stocked aquarium have several possible explanations. A shop's description of the water as fine, or one set of zero readings, cannot show what happened before or after the test.
Read guide →A separate tank can protect an injured fish and make observation easier, but moving a stressed fish into unstable water can add another problem. Start with the reason for separation and the conditions you can actually provide.
Read guide →