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Message: [QUOTE="GBBUDD, post: 464276, member: 10026"] There's a bit more to it then I have mentioned like how many pipes for the size of the shelf. Cutting the pipes instead of drilling holes. Possible clean out pipes at the end of the pipes. How much flow to send down the pipe for the size and length of the pipe . The size of the rock. Its a pretty simple process but to do it right requires a little more planning and discussion. Your pond is so big you need every ounce of bio you can get. What does the air pump do now ? [/QUOTE]