My fish are all dying!

[otakbun]

hi bros, damn, my fishes are all dying in my 2m tank. whats wrong with it?

[AquaObsession]

Please fill out this form when you're asking for help regarding tank problems

Tank Dimensions (LxWxH, specify units):

Lighting Intensity(No of Watts) :
Number and type of Lighting (FL/PL/MH) :
Age of light bulbs :
No. of hours your lights are on :

CO2 Injection Rate (bps) :
Type of CO2 (DIY/Cylinder) :
Method of Injection (e.g. Diffusor/Reactor) :

Liquid fertilisers Used (Product name. E.g. Seachem Flourish) :
Fertilization regime (Frequency and amount per dose) :

Other fertilisers (Product name. E.g. Root Monster) :

Other additives (Product name. E.g. Seachem Prime) :

Type of Filter (overhead/internal/canister, Product name/model if possible) :
When was the filter last washed :
Filter media used :
When was the media last changed :
What was changed :

Age of setup (i.e. since initial setup or last major re-do ) :

Water change frequency :
Amount changed :

Water surface movement (None/gentle/turbulent) :
Circulation (None/gentle/turbulent) :

Tank Temperature :

Chemical Properties (Fill what you can)
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KH (dKH):
GH (dGH):
pH :
NH4 (ppm):
NO2 (ppm):
NO3 (ppm):
PO4 (ppm):
Fe (ppm):

Bioload (Number and type of fish and plants)
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Describe your problem :
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[vinz]

You have a 2 metre tank?

Ok, now to your question. We can't help, because you have not given us enough information. Tell us as much as you can, like:

1. Histroy of the tank. When set up, any major changes made recently, etc.
2. Describe your setup. Details about size of tank, lighting, plants, fishes, filters, gravel, CO2, etc.
3. What did you do to the tank recently. Anything you did differently? Added something new? New fish, New plants? When were they added? Changed more water? Washed filter? Anything you that is new or different, even if you think it's complete normal.
4. What did you do to the tank in the last few days. even normal things like your regular water change should be mentioned.
5. How are the fish dying? Any symptoms, like gasping for air, before dying? thrashing about? Scratching themselves on rocks? Jumping? Are they full colour or pale? Any physical deformaties like bulging eyes, protruding scales, bloating, bleeding, fungus, sore, infections?

Oh... and what fish are they?

[kaganesti]

Have you rescaped your tank already?
You are refering to your 2 ft tank with your tetras and angelfish rite?