I don't know how hard it is to fix the glass but we just replaced our 20 gallon sump with a 29g so I have an extra 20 long if you decide it's too much to work to fix it.
Amber
29 gallon reef
pictures of some of my frags at frags.org
just get a new small patch piece and sylicone it with 100% sylicone on top of the crack. If it doesn't go to the edge it's that easy. if it is cracked to the edge, then you need to seal the entire tank again. but still easy...
I will just give my warning that your system will flood, bulbs will burn out, and things will take continuous maintenance... get over it.
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