To me it seems the old standard was that glass tanks 30" length or less, need at least one center brace even when there is the top rim providing anti-bow support.
The new standard I'm noticing is most manufacturers are now even bracing 30" glass rimmed tanks.
In my 30" rimmed braced glass tank, when filling or making waves with my hand while cleaning rocks, I noticed alot of bowing with the movements (despite having a center brace supporting just 15inch on each side, plus the top rim's support.) I mean, serious bowin like the glass is plastic all of a sudden.
I wouldnt just trust a manufacturer's blanket assurance their rimless tanks bowing is harmless. what about extra pressure cleaning and leaning while servicing tank?
Surprised this is the first issue with a rimless main tank bowing on here, if it is..