You have the best way. No one (that I know of) makes anything specifically for filling holes in acrylic. You can use clear quick set epoxy but it turns yellow in prolonged sunlight. I have used it to repair chipped glass tanks.
CHOMPERS;836315; said:If you are not going to laminate the sides, tape a piece of glass over the area with the holes. That will take care of one side; let gravity take care of the other side. You won't get perfection, but it will look decent.
timdolhelyg;846955; said:Have you started this project ? and new pics to show us ?
knobhill;851482; said:why not just use it as a bio ball tower and get a really big tank?
awfulalex;853448; said:Make a few holes in the divider for travel between two sides. how far from open side is the small holes? Maybe an idea would be to shorten the tank to this point so you don't have to struggle with the small holes (more holes = more potential leaks)
Also the bigger holes can be used for connecting pipes for input & output. I would flow water from left to right in the one side and revers on the other side.
But I would let this tank stand and run for a month or so and measure it regularly (especially in tee middle) to see if is buckleing anywhere.