I am about 50% done with my aquarium stand build - it will be for a 90 gallon tank, 42" long, 24" wide. I am using 2X4s, and I was focused on finding really straight pieces when I picked out the lumber at home depot. I am using 226 Stimson Kiln Dried HEM FIR STUDs. It is very straight and dry. And I have no doubt it will support the legs of the stand just fine (8 pieces will be used - 2 2X4 at each corner of the stand). However, As I was looking at my final top and bottom support frames, I noticed the lumber has some knots. The one in this picture is in a 2X4 that will support the top frame of the tank. The knot will have a supporting 2X4 leg under it (by chance) but do I need to go back and find 2 pieces that are knot free for the long spans of the top of the tank just to be safe? Anyone know the best lumber to use for this application?
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