How do you close holes drilled in the bottom of an acrylic tank?

You can cut a piece of cell cast acrylic and oversize it about 1/4-3/8" and place it on top and weld it with acrylic weld on #4



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Or just use a bulkhead fitting and cap it off


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For a non-permanent fix, you could use a bulkhead fitting to plug the hole.

For a permanent fix, you would want to use Weld-on acrylic cement to attach a larger sheet of acrylic to cover the hole. I would get a piece of acrylic at least 2" larger than the hole in every direction, but bigger would be even better. So that the bottom of your tank is flat, I would attach it on the inside of the aquarium and not underneath.

Check this link out for more tips: http://www.tapplastics.com/info/adhesives.php?

If you have a tap plastics in your area, I would go in and talk to them about the best way to go about sealing the hole (if you want a permanent fix). They sell scrap pieces for really cheap and you can practice on those before working on your tank because once the weld-on sets, there is no going back...it's there for good.

Edit: Jay beat me to the punch.

The round disc isn't necesary. Cell Cast acrylic and Extruded acrylic are both acrylic...the difference between the two is how they are manufactured. From what I understand you will probably get a better bond using cell cast.

I don't think Home Depot carries Weld On products...it's more of a specialty cement.

I would recommend going with bulkheads. By using acrylic to patch the holes you are hurting future resale value.

weld on #4 or #18 will work with any shape patch on the inside of your tank. Ive done this process many times with multiple thicknesses of acrylic. You dont need to fill the hole with a round piece, if your worried sometimes i flip the tanks over and fill them with #18 glue. For a first time youll probably have better luck with the #18 weldon, its thicker and easier to pour on large patches. I like using atleast 1/2" acrylic and either tape the acrylic in place or weight it down with anything heavy i can find. Dry time is 48hrs. I like to wait atleast 3 days before adding water to the tank. Good luck, easy fix for $50 or less check your local glass shop for scraps

I have a question, I have an opportunity to get a free 180 gallon drilled acrylic tank. The only issue is someone had drilled out the back bottom section, between back panel and bottom panel to make a tray slide for a bird cage. Can this be fixed or not worth the effort. (see pic below). Want to know if worth getting and fixing so can use. Will be at bottom of tank and could make in back so wouldn't really show.