Concrete to bond rock?

[Delphinus]

My tank is still using rockwork that was bonded into shapes using the stuff I found.

FWIW I don't even think "Emaco Architectural R400" exists anymore either, it's called something else now (because why not change the name a bunch more times).

I *think* this is it now: http://www.jamacsales.com/dt_portfol...architectural/

I have no idea if it still sets at a neutral pH. I would presume so but would be worthwhile researching or experimenting first before going full on with it in a new tank.

[Richard_Dicosimo]

I'd love to see pics if you have any Tony?

[Bryan]

I took the tank down long time ago, so really can't comment much on it long term. I have used the Reef Crest Aqua Weld and it worked not bad for cementing rocks, they have a PRO version, not sure what the difference is.

What works well is drilling a hole in the rock with a masonry bit and insert a acrylic dowel before cementing, adds a lot more support if doing overhangs etc.

[Richard_Dicosimo]

Originally Posted by Bryan

What works well is drilling a hole in the rock with a masonry bit and insert a acrylic dowel before cementing, adds a lot more support if doing overhangs etc.

Thanks for that tip. I will keep that in mind, now just to find some acrylic rod. I will have to check industrial pairs and plastics.

[albert_dao]

You could also just use a zap strap.

[Delphinus]

I don't have any good recent pictures. I did put up a before/after 7 years thing on IG about a year ago. I can't seem to link to the photo itself but the link to the photo is here: https://www.instagram.com/p/BeLw8owDHHf/

I do agree with the rod idea. It's hard to tell in the picture but the rock structure on the right is a bit of a floating over hang with a large cavernous area inside that the fish love to hang out in and sleep for the night. I did this with rocks drilled to accomodate a rod, and then zap strapped onto an acrylic base hidden under the sand that compensates for the otherwise uneven weight distribution (the overhang is pretty large).

I think I actually used fibreglass rods actually now that I think about it. You should be able to get both acrylic and fibreglass at IPP, but FWIW you can also get fibreglass rods at Canadian Tire. They're like driveway or parking lot markers for when there's lots of snow and you need to mark out the edges so you know where not to drive the snowplow. They have little reflectors on the top, just hacksaw that off.

[Richard_Dicosimo]

Love that instagram pic Tony! I love that overhang. Tank looks great.

So is a zap strap just a zip tie? I google zap strap and just looks like a zip tie. I figured the plastic would get brittle and break over time?