This may sound crazy, but...

[Rocksor]

As long as there is no downward flexing in the middle for the 48" that should work. For reference, my 8 ft 240g acrylic has a wooden stand (built by a carpenter who builds wooden aquarium stands) with supports along the edges and finished off with a plywood top (don't know if it's 1.5" or 2" thick). There's no beam that goes across the middle (front to back) under the plywood top and I haven't seen any middle sagging in the last 9 years.

The 72" is fine, and I would go with that config.

 

[FINWIN]

I just realized the width of the blocks...is that too many for the 90? Shouldn't it be one column on each end turned perpendicular? The blocks are 16" wide and tank width is 18...table top would still be 18.

 

[Rocksor]

I just realized the width of the blocks...is that too many for the 90? Shouldn't it be one column on each end turned perpendicular? The blocks are 16" wide and tank width is 18...table top would still be 18.

Yeah you could go 3 high 1 column on each side with the length (16") of the block going front to back (18") on the aquarium, making only 6 cinder blocks required. The caveat is to watch for the dipping in the middle, which could be alleviated with a column in the middle (9 total blocks) if is a concern for you. Something like this

| ---- |

 

[Rocksor]

Cinder block stand

What type if cat is that in the 3rd pic? Mottled bullhead This pic was taken a couple of years ago. Its about 12" now

www.monsterfishkeepers.com

The milk crates was one I never thought of before.

okay found an old post by D dogofwar

My fishroom is entirely on concrete blocks (6" ones) and two-by wood. Works great!

Found the pics ..........

View attachment 1301082


View attachment 1301083

 

[FINWIN]

Yeah you could go 3 high 1 column on each side with the length (16") of the block going front to back (18") on the aquarium, making only 6 cinder blocks required. The caveat is to watch for the dipping in the middle, which could be alleviated with a column in the middle (9 total blocks) if is a concern for you. Something like this

| ---- |

Cool, 9 is better than 12...I can roll with it. I was trying not to overthink the deal since I've seen some crazy looking block stands with the blocks on end...just seems weird and less stable to me.

 

[FJB]

This is not what the original thread referred to, but it is on the same vein.
I needed a stand for a new-to-me acrylic tank 72x18x20", and didn't want to spend money.
I had some lumber and plywood, and a metal 48" stand fit for a 75/90/110gal (the stand had been bought a while ago at a local Aquarium Club action for $14 !). I simply extended it using a frame of 2x4's and added legs. I am very happy with it. It is very strong, perfectly level, and will do the job nicely. It has more supporting elements (sheer) that what can now be seen, as I am still making a cabinet of sorts underneath. Then priming and painting black. Cheers!

View attachment IMG_0097 less.jpg

 

[FINWIN]

This is not what the original thread referred to, but it is on the same vein.
I needed a stand for a new-to-me acrylic tank 72x18x20", and didn't want to spend money.
I had some lumber and plywood, and a metal 48" stand fit for a 75/90/110gal (the stand had been bought a while ago at a local Aquarium Club action for $14 !). I simply extended it using a frame of 2x4's and added legs. I am very happy with it. It is very strong, perfectly level, and will do the job nicely. It has more supporting elements (sheer) that what can now be seen, as I am still making a cabinet of sorts underneath. Then priming and painting black. Cheers!

View attachment 1466480

Interesting. I'm still measuring the spaces where the tanks will go and orientation. Office space could handle 24" width if I reconfig stuff. Might end up with a 150 in the office and maybe a 120 in the fishroom partitioned for the three parrots if the depth works. I really want to get another Oscar to go with the chocolate, one of the synos and one of the acaras.

Cost is interesting...acrylic tanks overall are more but the gap's narrowing. Glass is cheaper but then u gotta pay someone to move it. So its a balancing act. If the 150 is 18" I'd probably go with four rows of blocks stacked three, going front to back.

Did you do weight calculations to know it would work?

 

[dogofwar]

Never hurts to put a piece of plywood on top of the blocks as a flat, rigid surface. Sometimes scraps are available at Home Depot or Lowes for cheap.

 

[FINWIN]

Never hurts to put a piece of plywood on top of the blocks as a flat, rigid surface. Sometimes scraps are available at Home Depot or Lowes for cheap.

That's the plan...I even considered a door blank but that's a bit pricey even at home depot.

 

[dogofwar]

They'll even cut it for you - and won't even complain if you slip them a buck or two

That's the plan...I even considered a door blank but that's a bit pricey even at home depot.