Save money and increase horizontal clearance by building the stand out of 2x4s and 3/4" plywood as the outside finish. At first, 225g volume and a 10' span seems a lot, but try to break a 2x4 with the narrow side up. You only need to support the tanks at the corners. In your case, be sure to incorporate vertical supports at the sides and at 5'/4' where the two tanks meet.
I would use 6' long 2x4 and stager them on top and bottom, front and back.
Go to a pet store and check out their stands, you'll notice they are made out of 1x1" and plywood, with plywood used to support the weight.
I have seen 500g stands made of acrylic only, instead of plywood like mentioned above.
I had a 225g setup made by Tennecor and the stand was made out of 3/4" MDF boards, no hoirizontal beams. It was a solid built box with open back and a vertical support in the center.
Just my opinion.
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