Tank crack patch

[bounce]

I am hoping to patch it as you described! I found a video that shows putting the silicone over the crack instead of a criss-cross to get the crack repaired and covered, and then going over the perimeter of the patch piece to seal it in place.
I picked up some "100% silicone" yesterday, its black in color and says its food safe, so Im imagining this means frog safe too, but odd it is black.... It says it is waterproof but also says its not recommended to be used exclusively under water, so I'm not sure what they are getting at but for $5 I'll try to get the tank working again. ...And put the ugly black patch side on the back.
The alternative of replacing the enormous piece of glass that has a relatively small crack in it seems a waste of money. I would need a piece that is ~3.5/4ft by 1.5/2 ft Not sure the cost on it, but if its over $20 I'm stingy and will attempt another way to fix it, if I invest more it becomes more of a surgical procedure instead of a free adventure if you will.

Thanks for the advice for the plane replacement method none the less, definitely want to make sure I've got the right ideas going.

[mats]

yes, well, putting the silicone over the crack on the inside was so plain for me I didn't mention it, the tape went on the outside naturally. the crisscrossing was more important when I did the bottom, as it takes away tension that otherwise might crack it again.

Good luck!

[bounce]

okay that makes sense, makes me wonder what other designs could be used to resolve the tension away from the crack.

[mats]

Thought you might like some pics, the fingers are on the original glass, and on the patch, and then a pic of the whole tank aswell. it will be getting new inhabitants in october.

[bounce]

Thanks for the pictures.
My patch has worked. I cleaned out the tank with vinegar and a scrubber and tore out the silicone on the edge where the crack was. I also took out some of the silicone around the area of the top and bottom so that the whole area was clear to reapply the silicone where I put the glass patch piece. I just sealed up the crack from the inside, and went around 2 edges with silicone then laid down the patch and sealed up the 2 remaining edges. Then I reapplied any silicone around where I tore it out, mostly along the bottom and the edge that the crack was on. That had 12 hours to cure before the rain hit, but the next day it was sunny again. I let it cure for 2 days then added silicone to the outside along the crack and the top bottom and corner to be sure it was sturdy. On day 3 I filled it with water and its holding!
Now the water has been there for 2 days with no leaks so its about time to add some media with bacteria in it so it will be safe for the fish.
I will only be living here another 3 months, when I move it ill get rid of the fish that's in it and use it for frogs or gekos or something, not sure yet.
I'll add a picture so you can see how ugly it is with the black silicone in a while.