[gio]

i drain my viv every once or so when the water color is more dark brown than light brown a nother way i know when to change the water is if it starts to smell it depens on if the water has contact with your substrait i tend to change the water every 3moths to clean bottled water with no chemicals

 

[gio]

what tipe of viv set up do you have and what (g??) is your tank

 

[gio]

i use the vivarium zoomed pump it easy to use and its very nice to have

 

[gio]

its $40 but its a good cleaning pump that rarely needs a justing or cleaning

 

[gio]

can you post a picture it would really help alot