Hey guys. I am running a canister for my tank. it has 3 plastic layer sections. inside each is as follows Top layer - Bio Balls and a bag of carbon Middle layer - wool filter - bio rings Bottom layer - black sponge - bio rings They are layerd in the order I have written them. So first off... sound like a good layering? Second. How do I change this bad boy, how often? I changed it today for the first time. cleaned out all the hoses with a string and a cloth tied to the end. Pulled out all the layer containers. rinsed the carbon out. rinsed the wool out. Rinsed the black sponge out. Poured out all the water inside. cleaned the bottom of the canister. Put it all back together. Filled it with new water. I also clean my tank at the same time. Cleaning all the walls, rinsing the sponge after each wipe to remove algae. squirted the rocks with my too small pipette. and vacuumed up the sand, while stirring at the same time. added new water to the tank. and put it all back together. A shot of white cloud came out from the water when I first turned it on. So... comments? And am I doing it right? or Should I change my methods? I also added a thick filter sponge I bought at the dollar store and cut up. I put this inside the screen intake end of the hose that goes from the tank to the canister... This way I can clean this and theoretically, my canister will stay cleaner longer. thanks in advance.