How sturdy are the knockdown stands?

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I have one of those knockdown stands that were made by All-Glass, I believe. I'm sure most everyone on the forum knows what I'm talking about. I was thinking of setting up a 29 gallon tank with a 20L sump underneath and was thinking of using the knockdown stand for it. The shelves are attached to the two side panels with screws. Do you think that this stand will be sturdy enough to hold the weight of a filled 29-nano and that of a 20L sump on the bottom shelf? What do you think? I want to use what I already have.

 

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IMO, I hate those stands...lol. However, there are many thousands of them being used in people's homes every day. Also, I'm not sure about AGA, but some aquarium manufacturer warranties are void or extremely shortened, if the tank is not put on the manufacturer's stand.