Helpp !!!

[Tyler1515669]

Hi my fish are extremely slim and they swim weakly i have 4 guppies in a 25 litre tank 2 have died over the past 2 days what do i do
I do water changes once a week 25 to 50 %

 

[DutchMuch]

cycling or no?

 

[Tyler1515669]

Yh i am

 

[DutchMuch]

that's the reason then.