hi , did not noticed you have a tank thread up , i'm sure the tank will hold up well , since my 4ft acrylic sump still holding up well for almost 1 yr already,
i also thinking of asking Henkabe to do a 4ft tank for me but not sure if they able to do up a strong 4x2.75x2 tank or not. but anyway it wont be this yr , maybe next yr. anyway if your rocks are not in yet , i would suggest that you spent a little more and get 1 big pc of nice LR to put in the tank , to avoid the issue of topping rocks as that would leave scars on your tank for sure