2 brick forge cracks

Joined
Jun 3, 2017
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811
I had a bunch of broken firebricks that i wanted to try to make a "2 brick forge" with. I roughly followed this thread in the stickies

https://www.bladeforums.com/threads/virtual-bbq-2-brick-forge-wip.920120/

First time i fired it up it cracked 2 bricks pretty bad. The thread said that i would get hairline cracks. Is what you see below a "hairline crack"? It works fine and all, i just wonder if it is going to get worse over time and if i will just end up with a mess on my hands?
poogsD7_d.jpg

GJO6wbi_d.jpg
 
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