Long crack lines appear upon filling up of "new" used tank!! Help!!!

Hi guys,

Recently I just bought a used tank from a nice brother in the forum. Tank age is about only 1 year+.

Tank was delivered yesterday and everything looks fine. I decided to let the tank rest for a day as informed by seller that a re-silicon job was done by the tank maker last friday, as it seems that the silicon has weakened even though the tank is only 1 year plus old...

Today I tried filling up the tank with water as I had to decom my fgt tank that is sold. However, I start hearing cracking sound and discover a long vertical crack line appearing on the front of the tank... it ran from one of the top bracing area to 3/4 down the tank... I used my finger and ran it across the crack line. I can feel both internal and external crack lines on both sides of the glass...

I immediately stopped filling up the tank and drained all water in it. I've contacted the tankmaker now pending for his reply....

Any bros encountered such similar incident before? Is it possible to replace the whole front glass under warranty as the crack could be caused by an improper silicon job done at the top bracing?

Need some advise here as urgently need to use this tank...