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help !!!!! corydora problem


BETTA999
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Keep in mind corydoras sometimes choose strange places and positions to rest (I did a double take the other day because one looked dead, half keeled-over but was just resting). If that is not the case are there any other visible signs of a potential issue? Have you tested your water parameters including temperature? Have you done anything different recently or changed some care routine? How long have the fish been in the tank? Do you have any pictures?

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The gasping indicates a respiratory issue of some sort. Either not enough oxygen in the water, or something impeding the function of the gills. Water temp is important to check as warmer water holds less oxygen. If the temperature spiked for some reason, it can deplete the water of oxygen.  If the water temp is fine, then check to be sure you've got some sort of aeration going on. Are any other fish appearing stressed or is it limited to the one fish? Not always the best indicator as sometimes one fish is more sensitive to an issue and you can think there's just something wrong with that fish when the whole tank could be in trouble, but the rest are just not showing the same symptoms yet. If you take ten people and drop them off in Denver (a mile high city) seven may seem perfectly fine. Two may have mild symptoms of oxygen deprivation when exerting. One person may be gasping at any activity.

Corys are bottom dwellers and the bottom of a water mass is often the least oxygenated. With him raising himself up and hanging onto a plant implies that the bottom of the tank might be oxygen deprived. Increasing water circulation might help things out by circulating more oxygen rich water throughout the tank. If you've got a heavily planted tank, it pays to remember that plants create oxygen during the light hours, but then absorb oxygen when it's dark. If you've just turned on the lights, odds are the tank is a bit oxygen deprived. More aeration is generally a good idea unless you're injecting CO2. 

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