Sometimes it's bad to go too long because you get all the dissolved organic wastes and all. You might get what you all blue-green algae. Unless you are plantman
My canisters are for bio filtration with a sponge on the intake for mechanical filtration and to keep the shrimp out. The sponge gets squeezed out once a week but the canister goes for months.
Thanks everyone.
I do one filter a month and i have three canisters so each filter gets cleaned once every three months. I was starting to think i wasn't cleaning my filters enough because i've read some people clean theirs a lot more frequantly.