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If you go on instant reef, then go on deals with tank lengths like 3ft, 4ft etc. You can get a good deal there saving money than buying separate pieces.
But it's good because you still get to choose the pieces you want in your package.
Search coral inserts in google and about 5 different companies come up. I think they are the only ones out there. Maybe there are some that I can't find. But looking at different companies your gonna be paying at least $200 for a good size insert. What's the length, width and depth of your tank?