Fish Health & Quarantine Guide

The Firewall: Quarantine (QT) Theory

In a closed ecosystem, pathogens (viruses, bacteria, parasites) have nowhere to go. They multiply exponentially and infect every host.

• The Rule: Never introduce a new specimen directly into your display tank.
• The QT Tank: A simple 5-10 gallon bare-bottom tank with a sponge filter and heater. It acts as a "firewall."
• The Protocol: New fish must remain in QT for 4 weeks.
• Week 1: Observation (eating behavior, stool quality).
• Week 2: Prophylactic treatment (Deworming).
• Week 3–4: Final observation. If no symptoms appear, they are cleared for the main system.

Diagnostic Framework: Reading Signs

Fish cannot speak, but they display clinical signs of distress. Use your Journal to log these daily.

Behavioral Symptoms

• Flashing: Fish rubbing their bodies against rocks/gravel.
• Diagnosis: External parasites (Ich, Flukes) irritating the skin.
• Piper/Gasping: Hanging at the surface, gulping air.
• Diagnosis: Hypoxia (low oxygen), Ammonia poisoning, or Gill Flukes.
• Clamped Fins: Holding fins tight against the body.
• Diagnosis: General stress, poor water quality, or early-stage bacterial infection.

Physical Symptoms

• White Spots (Ich): Salt-like grains on fins/body.
• Pathogen: Ichthyophthirius multifiliis (Protozoan).
• Cotton Growth: Fuzzy white patches.
• Pathogen: Saprolegnia (Fungus) or Columnaris (Bacteria).
• Bloating (Dropsy): Pinecone-like scales sticking out.
• Pathogen: Internal bacterial infection (Kidney failure). Usually fatal.

The Medicine Cabinet (Essential Reagents)

Do not wait for a fish to get sick to buy meds. Disease moves faster than shipping.

The "Holy Trinity"

1. Antiparasitic (Ich-X): Treats Ich and external protozoans. Safe for plants/snails.
2. Antibiotic (Erythromycin / Maracyn): Treats Gram-positive bacteria (Fin Rot, Popeye).
3. Dewormer (Praziquantel): Treats internal flukes and tapeworms.

The "Salt" Option

Aquarium Salt ($NaCl$) is a powerful electrolyte and mild antiseptic.

• Dosage: 1 tablespoon per 5 gallons.
• Use Case: Mild stress, fin nitpping, or Nitrite poisoning protection.
• Warning: Kills plants and scaleless fish (Corydoras/Loaches) at high doses.

Treatment Protocols

The "Heat" Method (For Ich)

Chemical-free treatment for tropical fish.

1. Raise Temp: Slowly increase heater to 86°F (30°C).
2. Mechanism: High heat speeds up the Ich lifecycle, forcing it into the free-swimming stage where it dies or cannot reproduce.
3. Duration: Maintain for 10 days. Add an airstone (warm water holds less oxygen).

The "Hospital" Isolation

If a fish in the main tank gets sick:

1. Isolate: Move "Patient Zero" to the QT tank immediately.
2. Treat: Dose medication only in the QT tank.

• Why: Antibiotics can kill your main tank's bio-filter (cycling bacteria). Never nuke the main display unless the entire population is infected.

Using the App for Pathology

The Journal Log

Pathology is data-driven.

• Entry: "Day 1: Subject A (Betta) shows lethargy. Day 2: White spot on dorsal fin."
• Analysis: This timeline distinguishes between a fast-killing bacteria (Columnaris) and a slow parasite (Ich).

The Health Lab Alert

• Stability Check: Before treating, check Water Quality Stability.
• The Link: 90% of "diseases" are actually just poor water quality lowering the fish's immune system. If Ammonia > 0, fix the water first. The fish will often heal itself once the stressor is removed.