1. My puffer
To the best of my knowledge Puffy is a green spotted puffer, but I wanted to make sure so here's a picture of the little guy. He's about 2 inches long now and I took him home in September (3 months ago). Diet is frozen blood worms and sometimes freeze dried shrimp.
2. Water parameters (via JBL test strips):
NO2: 0 mg/l
NO3: 0 mg/l
GH: >4°d
KH: 6°d
pH: 6.8-7.2
Cl2: 0 mg/l
3. Tank parameters
General: Freshwater (seeing Puffy is just two inches long), 150 liters, ADA Amazonia substrate, carpet plants that aren't growing very well, has an algae problem treated for the past month with Seachem Excel (liquid carbon) and liquid potassium, temperature 25° Celsius / 77°Fahrenheit, well lit 8 hours a day, has shaded hiding place for puffer, moderate water flow rate. Tank was established August and is fully cycled.
Inhabitants: Puffy, 11 neon tetras, 4 harlequin rasboras, ten Endlers guppies- all showing no symptoms.
4. Incident chronology:
2pm: All inhabitants displaying normal behavior. Did a 50% water change, as I have done several times before.
3pm: Found puffer stuck to filter intake. Moved him off with finger. Movements normal. Added new filter intake for a faster flow rate.
4pm: Found some drops of CO2 drop checker reagent leaked into tank. Removed remaining immediately. Leak may have occurred before puffer was found stuck to intake.
7pm: Observed puffer at surface, not moving much but in control of posture, not feeding. All other inhabitants normal.
7.10pm: Puffer vertical, head down, spinning and knocking head into substrate.
Moved puffer to isolation tank. 10 liters, 80% dechlorinated tap water 20% tank water, aerated, temperature 27° Celsius / 81°Fahrenheit.
7.20pm: Puffer in control of posture but knocking head into tank sides with some speed.
9pm: Back from store. Could not find Melafix in stock, Dosed JBL Ektol crystals to reduce stress and Ocean Free Yellow Powder in case of bacterial infection. Puffer displaying normal behavior, movements and posture.
2am: Puffer awake, displaying normal behavior, movements and posture.
3am (now): Puffer appears to be asleep, still exhibiting normal control of posture.
5. Questions
What do you think caused the symptoms described- exposure to drop checker reagent, bacterial infection or parasite infestation, swim bladder infection etc?
What course of action and/or medications would you recommend?
All responses greatly appreciated. Please help me.