Chin, I would never do a tank that large without cross bracing, but thats me. I,m not a huge euro brace fan myself, except where one wishes to reduce the typical water running over the edge thingy. Plus I would think euro bracing helps with jumpers, who seem to follow the glass up in a lot of cases.
They are a pin for running anything that needs attaching to a tank rim. I guess I agree with using the both of them or at least cross bracing and some euro, depending on your needs. Mine had the cross bracing installed first, as its the most important, then the euro butting up to it.
I,m guessing the ends of the euro which is basically cross bracing, gives major support to the ends, with the center two cross bracing supporting the center portion. The parallel front and rear euro section would be more for water stops and the such, at least, IMO.
Mike has a 5ft. by 2 by 2 and its just euro braced but your 27 & 31 is a lot of tank.
