Ensure you understand the specific requirements for this species (e.g., lifespan, maximum size, compatibility with existing tank mates, and specific water parameters). NEVER buy fish that will outgrow your tank or are known aggressors to your current stock.
Area | Key Questions to Ask the Seller | Documents to Verify |
Health | Does the fish show signs of common diseases (e.g., white spots/Ich, fin rot, cottony growths, clamped fins, severe bloating)? | Observe the fish for several minutes: is it swimming normally, eating well, and clear of visible parasites? |
Water Quality | What are the current readings for pH, temperature, salinity (if saltwater), and ammonia/nitrite/nitrate? | Ask the seller to show you current water test results before transport. |
Quarantine History | Has the seller quarantined this fish before introducing it to the main display tank? | Confirmation of a minimum 2-week quarantine period (best practice). |
Tank Size | What is the current tank size? What is the minimum size required for the species when fully grown? | Confirm the tank is appropriate for the species. |
Tank Mates: Is the species compatible with the fish currently in your tank (e.g., non-aggressive, same temperature range)?
Diet: What exact food is the fish currently eating (e.g., flakes, pellets, frozen, live)? Ensure you are prepared to maintain this diet.
Exotic Species Legality: For any exotic species, confirm that the sale and transport comply with federal and state regulations (e.g., Lacey Act restrictions, local fish and wildlife permits).
Safe Transport: How will the fish be safely bagged and transported? (It should be double-bagged with sufficient water and oxygen/air space).
Acclimation: Confirm the water temperature is maintained during transport. You must be prepared to properly acclimate the fish to your tank water upon arrival (e.g., drip acclimation).
Seller Location: Do not agree to meet in a location where the fish's transport environment cannot be controlled (e.g., cold parking lots).