I just patched these holes on the bottom of my acrylic tank with 1/4" acrylic pieces. I used weldon #16. It is on the inside bottom of a 460 gallon tank. Do you think this will be strong enough or should I add another 1/4 layer on top? Feed back please.
I think you are OK. But I would have made the patches over the singles holes a little bigger but whats done is done. Make sure you test fill before adding anything else to the tank.