I finish my scape with tonga branches using marco rocks mortar , thsi stuff works great and easy to use..i bought 10lbs bucket and it was a lot
i only used maybe 1/4. will sale the rest for $25 . its great stuff for aquascape and create cool structure..
http://www.marcorocks.com/aquascape-supplies/e-marco-400/
http://www.marcorocks.com/aquascape-supplies/e-marco-400/



