Elastic bands work well if in low flow so there is no movement(and not too tight). Just did one of my own this way. Just make sure fresh cut is clean and in good contact with rock surface. Rock size what ever you want depending on frag size.
Good luck!
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45 Gallon Cube with 10 Gallon Sump, Lighting 8 bulb T5, Vertex IN 80 Skimmer
-2 Occelaris Clowns, Engineer Goby, RBTA, Peppermint Shrimp
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