Help! Fish Gasping For Air Near Bottom Of Tank

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siebren

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I have 2 black neon tetras and 4 green neons, I have a 25 gallon tank, aqua clear 70 filter, air pump as well,
Tank has been cycling for 4 months.
The fish were fine for 2 days then they started gasping for air, near the bottom of the tank, there fins are clamped sometimes, they are not moving fast, just shaking in place almost, there also not eating,
I've done multiple water changes, last night I did a 80% water change and took out half my substrate, to no avail. The fish are still gasping for air near the bottom. I've done multiple water tests, ph is stable at 8.1 0 ammonia 0 nitrite 5ppm nitrate

I can tell my fish are getting weaker... if anyone has any suggestions please let me know
 

andychrissytank

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are they eating like their usual selves?
what about any ripped fins or small white dots, especially near the gills?
what kind of medicines do you have?
 

el337

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What's the temp of the tank? What's the pH of the tap water? Do you recall doing anything differently when you started noticing this behavior?
 

AvalancheDave

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How long ago were the fish added? Are you using any chemicals?
 
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siebren

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I don't remember Doing anything differently, the ph of the tap water is 8
Water temp is at 79
They are not eating at all anymore
They don't have any spots, no ripped fins, I also do not have any medication currently
 
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siebren

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The only chemicals I'm using is water conditioner the fish we're added 6 days ago
 

AWheeler

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Are you really shaking and hitting the number 2 nitrate test bottle off of things for like a minute straight?
 

AvalancheDave

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Did they eat initially? Sounds like they did. How did you cycle the tank and how did you acclimate the fish?
 
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siebren

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I do the tests properly
They did eat initially, for cycling the tank I just let it run for 2 months with plants. To accilate the fish, I let a drip into the bag and waited till it was 3x the volume then let them in the tank
 

AWheeler

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Do you have an air stone you can add? Maybe a picture of the fish would help us out.
 
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siebren

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My camera won't let me upload an , but I have a large air stone already
 

AWheeler

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Are they all going towards it?
 
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siebren

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No away from it, they stay under the filter/ under the heater on the far right side, my air stone is on the left side
 

AWheeler

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This might sound weird but unplug your heater for a few min and see if they act better.
 
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siebren

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Trying that now, been a few min, the green neons are acting like they have alittle more energy,they are nipping at each other, it it could be just a coincidence though.
 

AvalancheDave

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siebren said:
I do the tests properly
They did eat initially, for cycling the tank I just let it run for 2 months with plants. To accilate the fish, I let a drip into the bag and waited till it was 3x the volume then let them in the tank
You need an ammonia source when cycling...
 
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siebren

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I put some fish in after 1 1/2 months white cloud minnows, they had ammonia poisoning and died after about two weeks
 

AWheeler

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There might be a short in your heater....or they might just want cooler water.
 
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siebren

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It seems to have done something, one of my black neons now is more normal and opening his mouth less...I'm going to wait and see but it might have been the problem, either way thanks for the suggestion APierce!
 

AWheeler

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Great!
 
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