How much acrylic bowing is safe?

[West1]

The tank in question is a 27x27x24 tall 3/8 cell cast eurobrace tank. I have not filled it with water yet but how much bowing is acceptable till its no longer safe?

The plan is reef with wave makers.

Tyvm

 

[BadFish619]

Is there a top brace? They bow considerably but I've never been worried

 

[West1]

No center brace but a regular looking eurobrace tank. Top opening looks to be 12x18 (guesstimate)