Doug's 300DD Starphire Reef Build

Thanks Lynn. I get the foam from Home Depot.

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Tek, i used the foam on both my very large pillars, and i have 8 lb ledges overhanging in various directions. you have to dry out the rock you plan to create your arch out of, then drill tiny holes so you can zip tie the rocks together, you can use the pond foam as a glue or adhesive, then cover it in resin and sand, and it will hold up guaranteed. i used rod to pin things together in some places thinking the foam wouldnt be sturdy enough, but i must say now that it is done the faom could probably hold a house together :)
 
Tek, i used the foam on both my very large pillars, and i have 8 lb ledges overhanging in various directions. you have to dry out the rock you plan to create your arch out of, then drill tiny holes so you can zip tie the rocks together, you can use the pond foam as a glue or adhesive, then cover it in resin and sand, and it will hold up guaranteed. i used rod to pin things together in some places thinking the foam wouldnt be sturdy enough, but i must say now that it is done the faom could probably hold a house together :)

Tek, I would have to agree with ftexas. Zip ties will hold alot of weight along with the foam. Personally I would want the protection of the zip ties or rods. And when the resin is applied to the pond foam you have very strong arches and overhangs.
 
I was thinking about a short rock stable arch with the foam just for extra support from rocking or bumps. Nothing crazy for a little 65g.
 
And some pics of foam rock wall almost complete. Need some touch up on some spots to cover all foam. Haven't applied resin to back as of yet.

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