Swollen Eye

EliK

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A few days ago I noticed that one of my Glofish Tetras seemed to be in distress, spending most of the time unmoving in a corner of the tank.
I quarantined the fish in a 2L tank with a little salt added to the water.
I cleaned the original tank thoroughly and did a 75% water change.
Today, I noticed that (1) the quarantined tetra's right eye is swollen, and (2) another tetra in the original tank also seems lethargic.

The original tank is 60L (30x60x45cm) and contains a mix of black skirt tetras (natural, albino, and Glofish, all 1" to 1.5" long. I've had them between 1.5-2.5 years, some of the fish for longer than others), as well as one pleco, one tiger barb, and one small angelfish (there's a story behind where I got the later two, and I know the pairing is not ideal - I would love to get more of each type to keep them in groups, but I can't start more tanks right now.) No new fish have been added to the tank in at least 6 months.

Two fish from the tank have died in the last month, but the water parameters were normal, and I did not think much of it, since I have read that the normal lifespan of these fish is 3 years, and I have had some of them for close to that time.

Tank parameters (original tank and quarantine tank):
Temp 82'F
ammonia 0ppm
nitrite 0
nitrate <80ppm in original tank, <10 in quarantine tank


PA041633.JPG
 
I think the problem might be the nitrate. Most people these days believe anything more than 20ppm is risky. It may keep the water nice and acidic, but that is not the ideal way to do it.

Many years ago all the books and magazines said 80-100ppm was normal. They suggested 20% water changes if ever the nitrate was above 100ppm.

I believe some fish are more sensitive to nitrate than others. It is known to gradually cause hole in the head disease in cichlids for instance.
 
I usually try to keep my nitrite under 10ppm, and do frequent 50-75% water changes - but it still occasionally goes higher, as it did now.
 

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