Eggcrate for rock

[eli@fijireefrock.com]

Not sure if I agree I mean talking about my old setup 180glns display I had egg-crate running where my rock was going to be and I silicone it to the bottom pane then sand then the rock pressed to hit the eggcrate.
Not sure if it did anything but in my mind my rock work was sturdy but still few tumbles only my fault.Although my new setup with using Fijicrete I am sure not going to use any egg-crate and all rocks will be glued in place.

[Snappy]

Eggcrate under sand & rock sounds to me like a recipe for a nitrate build up.

[jonn46]

I have used egg crate under my rock without any problems for years but I am about to set up my 180 and am interested what the alternative is. I have a pistol shrimp and convict blenny, these two guys can completely undermine a large rock in one night.

[Aquattro]

Originally Posted by jonn46

I have used egg crate under my rock without any problems for years but I am about to set up my 180 and am interested what the alternative is. I have a pistol shrimp and convict blenny, these two guys can completely undermine a large rock in one night.

The alternative is not using it. Simply arrange the rock on the glass, add sand around it and nothing can dig underneath.

[jonn46]

I have worried about pressure points or small areas of the rock putting all the weight in one small area on the glass.

[Aquattro]

Originally Posted by jonn46

I have worried about pressure points or small areas of the rock putting all the weight in one small area on the glass.

Not something to worry about unless the rock is the size of a small car. Any rock you use will have either a fairly large single spot or multiple points of contact.
As an example of the strength of glass, I tried to remove a center brace once with a hammer. It was unbelievable how hard I had to smack it to get it to break. Unless you're throwing rocks into the tank, you have nothing to worry about

[jonn46]

Interesting, maybe I will go that route on my new one, thanks!

[Doug]

Originally Posted by Snappy

Eggcrate under sand & rock sounds to me like a recipe for a nitrate build up.

I dont get that one Greg?

[Aquattro]

Originally Posted by Doug

I dont get that one Greg?

I suppose, technically, it could restrict water movement, although I haven't found this to be the case with 2" of sand or less. My NO3 has always been 0.

[tang daddy]

I heard some guys mention fijicrete, is that a cement??