Remove Center Weir from acrylic tank

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TarHeel671

Feeder Fish
MFK Member
Oct 7, 2025
5
2
3
40
El Paso, TX
I have a 10' x 3' acrylic tank. It has a center overflow weir right in the middle of it and am wanting to remove it. Does anyone have any experience removing these from an acrylic tank. What tools did you use? I am thinking of using an oscillating multi-tool but would like to hear feedback before doing this.
 
I have a 10' x 3' acrylic tank. It has a center overflow weir right in the middle of it and am wanting to remove it. Does anyone have any experience removing these from an acrylic tank. What tools did you use? I am thinking of using an oscillating multi-tool but would like to hear feedback before doing this.
Dremel with a rotozip blade will work but there pretty wild and jump all over the place. A regular fine tooth hack saw blade for pvc pipe works well (just the blade) by hand. Its not a quick process but will get you the closest to the bottom sheet and require less sanding. After the cut sand it down flush smooth 💀🤙… if ur patching the floor after i recommend weld on # 40 or #16 for the patch.

I Do Not recommend the multitool… it will vibrate too hard and just crack the material, possibly the bottom.

215A287A-83A0-42AE-BC29-EE91C7B55BA0.jpeg
 
Dremel with a rotozip blade will work but there pretty wild and jump all over the place. A regular fine tooth hack saw blade for pvc pipe works well (just the blade) by hand. Its not a quick process but will get you the closest to the bottom sheet and require less sanding. After the cut sand it down flush smooth 💀🤙… if ur patching the floor after i recommend weld on # 40 or #16 for the patch.

I Do Not recommend the multitool… it will vibrate too hard and just crack the material, possibly the bottom.

View attachment 1568799
Thank you, ill probably try the hacksaw for removal. What do you recommend for drilling holes at the top for canister filters, the top is 3/4" acrylic.
 
Thank you, ill probably try the hacksaw for removal. What do you recommend for drilling holes at the top for canister filters, the top is 3/4" acrylic.

+1 to the angle grinder with a cut off wheel… it melts things a bit and gets hot but does make quick work for cutting. Just be sure to wear safety glasses and long sleeves it sticks to ur arms 😂💀

For drilling, hole saws for wood are what ur looking for. I like the ones with alot of small teeth and a pilot bit. I also like using a battery powered drill over a corded one. The corded drills are too strong. For 3/4” i like to drill half way from each side also. The pilot bit inside the hole saw bit will line it up for you. If u try to do it from 1 side the bit can get trapped in the material because it heats up alot and expands as ur drilling.

These are the style bits i like… ace hardware/handman has the small tooth ones with pilot bits. Home depot/lowes sometimes dont carry them.

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