I know it has not worked out the way you wanted it to, but you should be proud of what you have accomplished and learned.
My two cents is to spend about ~120$ on two 8'x4'0.25" HDPE panels and silicone the cut to fit panels in place on top of the epoxy with 100 silicon% for plastic. You can find this 100% silicon for plastic in the plastic/lexan area of Home Depot.
If you do this, silicone the hdpe panels in between joints and inside corners. This will make it water tight, if the corners are ridged.
The plywood has probably got wet enough times it is weaker than the aquarium was engineered for. You will probably have to build a 2x4 cage around the sides and back. Also connect the cage around the front of the tank where there is wood. I.e. Leave the front viewable, but the window will be set in the width of a 2x4.
Good luck
My two cents is to spend about ~120$ on two 8'x4'0.25" HDPE panels and silicone the cut to fit panels in place on top of the epoxy with 100 silicon% for plastic. You can find this 100% silicon for plastic in the plastic/lexan area of Home Depot.
If you do this, silicone the hdpe panels in between joints and inside corners. This will make it water tight, if the corners are ridged.
The plywood has probably got wet enough times it is weaker than the aquarium was engineered for. You will probably have to build a 2x4 cage around the sides and back. Also connect the cage around the front of the tank where there is wood. I.e. Leave the front viewable, but the window will be set in the width of a 2x4.
Good luck