So it's come down to me having to toss the stand that my 125 is on. I'm just wondering whats the best design for a stand with cinder blocks and 4x4's?

Lol a strong one. I have built wooden stands but not out of cinder blocks. So I can't you much there

Just keep in mind that a 125 will weigh half a ton (453 kg) when filled with water, so a strong design is important.

if your tank is acrylic, you will need full support along the entire surface of the bottom (meaning you can't just support the edges)

I saw a video on youtube of an aquaponics set up. They had what looked like 4 30 gallon tanks on one shelf consisting of cinder blocks with 4x4 through the holes. These shelves of tanks were 3 levels high and fairly long. I'm thinking something like these would work.

www.google.com/imgres?imgurl=http://virt...&ved=0CDAQ9QEwAw

and my tank is glass.