I need to know why?

[Elemistic]

This leaf fish have been with me for quite awhile now.
There is a problem today after i got home from work.
My leaf fish seems to be dead like the picture above. But in fact, it is still breathing.
May i know what is the reason and how can i treat it?
If there is prob with the water, other fishes would be reacting the same way.

 

[VIPER006962948]

Have you tested your water?

 

[Elemistic]

Nitrate lvl is 15 ppm
Ph value is about 6.5

So i need to take out the fish to another small tank or change the water?
Is there a possible cause? Overcrowding?

 

[puffykid]

do you know your nitrite and ammonia levels? It would let us know if you cycled your tank. Also maybe what size tank are they in?

 

[VIPER006962948]

Nitrate lvl is 15 ppm
Ph value is about 6.5

So i need to take out the fish to another small tank or change the water?
Is there a possible cause? Overcrowding?

Check ammonia, nitites and Start 20% wcs. What's temp in the tank and do you have surface agitation?

How old is the fish

 

[Elemistic]

Check ammonia, nitites and Start 20% wcs. What's temp in the tank and do you have surface agitation?

How old is the fish

I recently got this fish from a friend. Not so sure about how long did he kept the fish for.
Tank temp is about 28degree Celsius.
Yes, there is surface agitation.

 

[puffykid]

Please get a test kit that isn't strip based and give us a reading on your ammonia and nitrites. Is the fish still alive?