[untamed]

I decided to go with acrylic on my 400 for exactly the three reasons that you mention.

I would do it again...especially because of points #1 and #2. Brute force or build on site can overcome point #3.

While everyone always said "scratches..scratches..". I thought I could overcome this by being careful. What no one told me was that it is the FISH that cause ALL the scratching I have. In fact, I've had to remove my Triggerfish from the system because their skin was too abrasive. Tangs leave the occasional nick from their spines. I have polishing pads on the way, but it remains to be seen if I can remove the damage.

I have also found it especially useful to be able to crawl over the top of my tank while doing maintenance (the tank is 1" acyrlic all around). The builder (Envision, Oregon) demonstrated the strength of his build by jumping up and down on the cross braces across the top of the tank. Try that with a glass tank!