I have a Marineland 300 DD and mine are mounted like the above, except in three rows of three.
Back
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Front
What are the dimensions on that tank?
Steve
L 72" x W 36" x H 28"
Are you using the AI mounting rails or something else? Do you have picture of them?
I am using three 36" AI Rails sets (tank is 36" front to back). Here is a pic.