HOB Refuge weight?

OK, so I got a LG CPR HOB refuge for my 46g but since that is about a month out, I thought I may as well put it on the tank that is running. I had just water in it with some cheato and one other type of micro algae it was given to me by my buddy down the road it was like that for a day. I just added sand its not 6in deep by no means but its a couple of inches is it really ok to put that much weight hanging off your aquarium?
 
I had one hanging off my 55. But I did support it underneath with a piece of wood. I just did it to ease my mind. I don't think it's really necessary.
 
OK cool I was just wondering about as I was putting the sand in at that point it was to late. I think I am going to run out to my Dad's and cut piece of wood to take a little weight off just to ease my mind as well.
 
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