Guppy is frantic!

[diggerofbeats]

Hello, I have a small 6.5 gallon tank and introduced some guppies nearly 2 weeks ago. In the last 2 days one of my female guppies has gone a bit strange. She seems to be swimming rather aimlessly and sometimes v quickly. Most of the day she is swimming against the flow of the filter and it's a bit worrying.

This is the results of a water test. PH is 7.4
Ammonia 0.2ppm
Nitrite 0ppm
Nitrate 40ppm

help! Is this normal behaviour?

 

[Tokis-Phoenix]

What other fish is she with and how many are there in total?
A 6.5gal tank is quite a small tank is very easy to overstock, you've got some ammonia which isn't good so i'd do a 40% water change to help lower it.

 

[WILDER]

Tokis it's being answered now in the hospital forum, thought i would let you no.