Hi. Please can anyone help me, with some advice concerning ceramic noodles. I have read the manual for my AquaStyle 380 Aquarium, and it says never wash them with tap water, I already knew that part. What I am asking is do they ever need changing, and am I ok to rinse them with the water I remove, when I change the 25% of water! I do this weekly now! but I only want to know to rinse them when there is some residue in the bottom of the filtration unit. I now how purchased an API FreshWater-master test kit, so I can keep my eye on the water condition. I am learning slowly, but any help & advice would be taken on board, and very great full too. Hope this all makes sense many thanks for reading Paul.