one tip i thought of for laying out rock work. this mostly applies to new tank setups but cut a piece of cardboard the exact dimension of the inside of your tank, you can then ,depending on the size, take it to the fish store with you to help in buying pieces of rock and laying it out on the cardboard, i'm going to use this idea for the new tank in doing up my pvc structure rather than leaning in the tank to do it i'll just lay it out on the cardboard. i used it for my other tanks and it worked great
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