Hi Hollie! I'm not familiar with that kind of filter... but the rule of thumb I use is every four weeks. Main thing to remember... Don't change them all at the same time. My filter has a foam and a carbon. The first weekend of the month I change the carbon, and the third weekend of the month I change the foam. It makes sure that your not stripping your filter of the good bacteria
Check the boxes too - some filters might have different suggestions for how often to change media.
Have fun!
My Tanks: 20g - planted - 1 cory, 4 otos, 4 shrimp, 4 swordtails, 2 angelfish 10g - 6 pygmy cories, 3 yamato shrimp, 3 otos
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