cinder block stand

I have this setup in my basement currently and its been running really nicely for a while. I was considering ways to get 2 40 Breeders on the bottom instead of the tubs (more water volume & better visibility, can light from behind, etc), but they won't fit between the stacked cinder blocks...

Hi! So recently I got a 80 Gallon Deep Blue Aquarium 48x24x16 for a good price. Plan is to upgrade my existing 55 gallon tank to this and move it to the basement. Since we got the tank for a really good price I wanted to keep the savings and build my own stand. So I decided to go with the...