Acrylic question!

Ok, so I just purchased a used acrylic 180g tank. It's a clarity plus that's 9 years old. So my question is this, where can I get the liquid bonding cement, there is a crack on the top of the tank. The crack is from the corner of the top opening to the back of the tank, I don't think it affects the tanks ability to hold water I'd just like to fix it. My second question is a little more complicated, this tank has a blue back (which) I hate but couldn't pass up on the deal, is there any thing that is fish safe that I can paint the inside of the tank black with? It would have to be fish safe and be able to stick permanently to acrylic. The other option to this would be to be able to buy and stick a paper background inside the tank. Any help as always greatly appreciated and thanks in advanced.


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I'm looking for the liquid form of cement since its a crack I'd like it to be thin enough to run into it as much as possible. Sandwiching a separate piece of acrylic is something I had thought of as well. I like the idea of inserting a separate back to the tank, but do to the size of the top opening it may have to go in in three pieces. I just hope the seems don't stand out too much. Thanks for the ideas guys.


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