Hi all, hoping someone may be able to enlighten me. I purchased four White Cloud Mountain Minnows nearly 2 weeks ago. All was fine until last Wednesday evening one of them looked as though it couldn't close it's mouth - it had it permanently open. Within half an hour it was floating about, sometimes upside down, in the water and then it would start swimming normally again. It kept on doing this, floating head down/up, tip over and then float about the tank until an hour later it just drifted to the bottom of the tank and died. No other marks on the fish.
All the other fish in the tank (2 Honey Gouramis, 2 Twin-tailed Guppies, 2 male Guppies and the 3 remaining Minnows) all seemed fine until today. We had noticed that the small Minnow was hanging around above the heater for the past few days but didn't put it down to anything. Noticed a couple of hours ago that it's lost it's balance and is sometimes floating about the tank like the other did, other times it wedges itself under leaves and at the base of plants. It's mouth is closed, unlike the one that died last week. Have done a 30% water change because of quite high nitrate reading last night and used a de-chlorinator.
Last nights readings are: Ammonia 0, Nitrite 0, Nitrate 40ppm (was 20 the evening before). The tank is 18" x 13" x 15".
Any advice?
All the other fish in the tank (2 Honey Gouramis, 2 Twin-tailed Guppies, 2 male Guppies and the 3 remaining Minnows) all seemed fine until today. We had noticed that the small Minnow was hanging around above the heater for the past few days but didn't put it down to anything. Noticed a couple of hours ago that it's lost it's balance and is sometimes floating about the tank like the other did, other times it wedges itself under leaves and at the base of plants. It's mouth is closed, unlike the one that died last week. Have done a 30% water change because of quite high nitrate reading last night and used a de-chlorinator.
Last nights readings are: Ammonia 0, Nitrite 0, Nitrate 40ppm (was 20 the evening before). The tank is 18" x 13" x 15".
Any advice?