im at this same point in my design phase. im planing on waterfall i think but it is alot more challanging to design then i thought. might just have to settle for a stream. you can build one with pvc and elbows. glue them together and then cut in in half so you have 2 identicle trenches. just glue them to your fb and pile the substrate all around and you will have your stream. you can silicone rocks or sand or something in the stream to make it more natural.
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