Combining two acrylic tanks.... Thoughts?

If trying to combine them back to back, to make more of a square shape, you would need to make mending plates out of acrylic for the seams and probably make a semi perminent base out of plywood and some 2x4s for underneath the tanks to reduce strain in the middle along the seam.
Definantly possible though.

Use weld-on #40 or #42. It's way stronger than #4 or #16. And if done right you wouldn't need a plate to cover it. And a good seem is hard to see. Try to find Wednesday13. He may be able to help you more than I can.

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Yeah u could probably do it but whats the point lol...especially if u plan on using a possible divider. Just run both tanks off one sump and its essentially the same idea. Ur add on pieces would never hold, ud need to butt the tanks together, glue in between the sides and cut the space out. Then glue again on the outside and buff it all out. Have fun tipping 2 different sized tanks over to glue the outside bottom praying the small area of adhesion holds ....possible but not very practical. If the wall hides the seam it will look like 2 tanks anyway?

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You could make more of a giant square tube attaching both tanks. It would be completly full of water, not open top like ur design and would work. Just cut two holes the same size, glue ur acrylic square tube shape to the inside wall of the acrylic and viola...

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i think that it is a great idea. i would love to have a tank like that. as far as doing it, the square tube is a good idea. if you cut the hole slightly smaller than the tube, then you can glue the tube onto the tanks, then use a flush cut router to make the hole perfect. the router bit would also bbe a good idea to make sure that the edges of your square tube are perfectly straight and square.

A cylinder might be even stronger since it would have 4 less seams to worry about. I used to have a custom acrylic tank that was basically two separate tanks with two clear tubes in the middle. There was also a thin sheet of acrylic in front of them for extra support. Here's the only pics I could find, I had it all divided while putting together another tank but that setup was very temporary lol

Maybe I missed something...why not just cut the holes and weld the tanks directly together? That would be very strong if enough material is left around the cut outs.

scott s said:

Maybe I missed something...why not just cut the holes and weld the tanks directly together? That would be very strong if enough material is left around the cut outs.

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In order for them to glue properly you would have to stand the tanks on end which would mean they would be 12-15 feet tall. If you built a square tunnel that inserted into the tanks you could cement one side at a time and roll the tanks to get the other side. If both tanks are not same dimensions you will have a heck of a time propping the smaller tank when rolling.