Seal the crack and reenforce the bottom of the tank (But some 2X4s or steel rods along the bottom and put supports in the middle if theres room) Hopefully is should hold. I hope you get what I meant by reenforce it too.
I once had some Neon Tetras when I was 3...They all died and my dad swore he would never get anymore fish...I had a 7th grade science teacher who had a 95ga
SW in his class...now I got a 90ga and hundreds of $$$ of coral, fish and inverts lol.
My teacher got me into reefkeeping last year, and now I've got a tank about the size as his. I found out the other day that he has a 180Ga so now I NEEEDDD that 145ga lol. I guess were having a contest for biggest tank...