Sponge Filter?

[pixiesandfairies]

After checking my water in my 3 aquaone 320`s, They each have a sponge filter in them with the bubbles turned down low, but one is cloudy and they are all alittle high in nitrite and nitrate. Is this because of using a sponge filter? How often should i do a water change?

 

[Hawkins]

i do a water change once a week, but if you test your water every few days then you can see your levels then decide when to do water changes.

 

[modaz]

simply, extract some tank water out of the tank and squeeze the sponge in it to clean it and replace the sponge, it sounds like it is full.

 

[pixiesandfairies]

Yep do everything you (mod daz) said every sunday. Why would only one go cloudy?