reef safe brick or block

[jimbo78]

i need to raise my skimmer up about four inches in my sump, does anyone know what i should put under it? is there a reef safe brick or block that can be used or something like that?

 

[scrapman]

I would use a section of gray PVC pipe of the right diameter.

 

[reefergeorge]

I made a shelf out of pvc and eggcrate.