Hi, I have an adjustable 2 shelf open bookcase with slat shelves (all wood) that I screwed corner braces (2 1/2 inch "L") to on top of the shelf and below. 4 Corners with bracket above and below shelf to the legs = 8 braces per shelf. I currently have a 10 gallon tank on each shelf. Would this be sturdy enough to put a 29 gallon tank on one shelf and a ten on the other? It fits perfectly where it is. Opinions would be appreciated. Thank you