Tank Stand

[BCOrchidGuy]

You could simply run lengths of 2x4 across the stand... IE
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So say that's your stand from above simply lay 2x4s so they run this way

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This would probably work but, I'd rather redo the stand properly, you'll enjoy a more stable structure with a wider foot print.

All that being said, why not phone King Ed and ask them if they have any used pine 90 gallon stands around. I bet you could get one for $100

Doug