Any time man… 10 legs is overkill… 8 would have been overkill and 6 would have held with the same design just fine. Theres an OG sticky on here that gives the calculations/specs for weight a 2x4 will hold using the same stand design u did. Ive built it for myself, others and even for an entire wholesale coral warehouse i worked at using 6,8 and 10 legs. The older i get and the more ive built… the less legs i use . The 3/4” top wood, great choice there also. Ive used 1/2” and even none with just more 2x4 cross beams to spread the weight. Another tip is place ur acrylic right on that ply wood. Do not listen to people telling u to use foam or a bs “leveling mat”… level from the floor up with shims. If theres any air gaps u can shim in between the 2x4 and ply top. I have 450-500’s shimmed right under the acrylic also. Ur cross braces, perfect as well. Rule of thumb for acrylic is support every 2’ and thats without plywood.
Just noticed its actually 12 legs and im counting the doubled up as singles lol . No1 wraps the whole thing in ply either. That adds even more strength.
Really a great job on this across the board. If u ever go to a sump u can cut out those middle end legs even and never worry.