PVC pipe and aquascape

I have almost all my rock sitting on a PVC structure in my 500gal tank . The PVC structure forms a large cave that the fish can swim under and hange out. The structure also carries water that is expelled at various location throughout the tank. This along with a closed loop is all the circulation I have in my tank. I dont use any powerheads. I used plastic zip ties to attach the rock to the PVC but with a structure this large, I had trouble hiding it completely. However, most of the exposed sections are starting to get covered in corraline. The PVC has allowed me to have a lot more sand exposed than I would have otherwise.

I also use less light than most people would in a  tank this size. This is beacsue the PVC allows me to raise the light loving corals up closer to the light. I used to only have 2 400watt MH buls and 2 90watt PCs. I later added another 400watt MH and get really good growth. You are welcome to come and check it out.

Asad

I have one small PVC stand in my tank that creates a nice cave for the fish to hang out in.  The idea was to make it so I could see the fish while they are in there, but I've since nearly filled in the front with more rock.

I don't have mine sealed to keep water out.  That might create buoyance problems until you stacked enough rock on it.  No big deal, but annoying when first setting it up.  I personally see no reason for it.

Cool, I've seen Kevin's and Dinhkim's tanks, and I did really like both of your aquascapes.  Did you guys have a hard time tying the rock with zip cords in a tank that is already filled?  So I'm alittle confused, it sounds like you guys have your rock totally off your sand bed.  That sounds like a really good idea, but I just want to make sure I am under standing you guys correctly.

Connie if you could post pictures of your stuff, that would be awesome.

Ryan

How much are they off?  I can't remember.

The owner of this tank uses pvc to stack his rock on and it is also a part of a closed loop system. Plus it is one of the greates tanks I have ever seen and hope to use some of his ideas in my own. www.oregonreef.com

 I have drilled into LBTR to add a piece of acrylic dowle. You can get it at Regional Supply. I used it to make a funky arch which was very stable. I did add another one, but then had to redo the whole thing 'cause it looked like the golden arches!

 I have a PVC table and we can see it very clearly when you look in the back of the tank. I'll get a pic tomorrow!

Well I personnaly would use 3/4".