I would want to know what caused the crack in the brace? Was the tank handled improperly? What may the consequences be down the road if the tank structure was stressed?
I would query your neighbor about how it got cracked.
125gal FOWLR, 20L Sump w/LR and Skimmer, 20T Fuge w/DSB, Cheato, Pods and Algae Turf Scrubber