Concrete Block Stand

Mad Marine · May 23, 2025

I am looking for advice on a DIY stand. Details below.

Aquarium:
1120mm (44") Long x 650mm (25") Wide x 500mm (19") High

Weight:
Tank + water + rock = 1000 lbs

Stand:
4 x 215mm (8") square concrete blocks at each corner. The gap in the centre is 690mm (27"). Please see the attached rough sketch for reference.

I plan to use two full-length timber sleepers, 200mm (8") x 100mm (4"), laid on top of the blocks. Please see the attached picture for reference.

Would this work? Please share your thoughts and any recommendations.

Thank you.

Josh

TX_REEF · May 23, 2025

yes, it would be perfectly fine. The timbers and concrete blocks can handle significantly more weight than 1000 lbs. My only concern would be stability, as the structure could fall over if someone bumped into it, if the blocks and timbers are not secured.

Fish Fan · May 23, 2025

TX_REEF said:
yes, it would be perfectly fine. The timbers and concrete blocks can handle significantly more weight than 1000 lbs. My only concern would be stability, as the structure could fall over if someone bumped into it, if the blocks and timbers are not secured.

^Beat me to it lol! I also agree about the stability of the blocks.

Hello!
Your tank is about 340L/90G, which is not a super large tank. I believe those timbers would be way overkill. That span (about 27") can be supported by 2x4's no problem.

I'm also not the biggest fan of cinderblock stands, I just think there's at least a possibility it could somehow get knocked over.

Have you considered building an easy 2x4 stand frame? Here's plans for such a stand that are tried and true. You can leave it with just the 2x4's, or "skin" it with plywood or even pre finished panel boards. Add some simple trim, and you have a very stable and great looking tank.

Here's the plans, which also give solid advice on what size board to span whatever width for a given tank volume. The author of these plans is also an active member here on R2R who may be able to help you if needed: