What's the Problem with my Fish?

[TripleB67]

I've got 5 Cobra Endler Guppies and have had them for about a week now. Yesterday morning I noticed one of them lying on the bottom of my aquarium. I thought it was going to be another 'neon tetra' episode like I had 2 weeks ago when each neon rested on the bottom for an hour or so, started swimming around erratically, and then started floating up-side-down (all within about 3 hours).

So last night I expected the same from my Endler. But no, it was still lying on the bottom, only to come up to take a nibble of food. This morning I expected to find him/her no longer living. But there he/she was lying on the bottom again, not moving much, but very much alive.

This afternoon I couldn't find him/her so I had my wife look while I went to play tennis with my daughter. He/she was lying sort of underneath the bottom of a plant I have in my tank. Again, very much alive but not moving unless I were to move the tank.

Does anyone have a clue as to what may be going on with this fish?

Thanks for any and all help.

TripleB67

 

[okapizebra]

Did you cycle your tank prior to adding the fish? Do you notice any other visible signs of illness or injury?

 

[TripleB67]

Did you cycle your tank prior to adding the fish? Do you notice any other visible signs of illness or injury?

Yes, the tank was cycled before I added the fish. I do not see any other signs of an illness or an injury.

TripleB67

 

[okapizebra]

Hmm. What are you current tank parameters? (Ammonia, nitrite, and nitrate)

 

[TripleB67]

This morning he/she is futher up under the bottom of the plant (almost like some pebbles were moved) and still alive.

TripleB67

 

[greenterrortigeroscar]

What is the tanks status report?

 

[okapizebra]

We need to know your tank params... This will help us figure out what is wrong with him.