Hi Guys, I have a standard 4ft tank that I am planning on using for a paludarium. I don't have the correct tools to measure glass thickness precisely but using a tape measure it looks to be about 5 or 6mm. Given that I will be making it into a paludarium I am only planning on filling it with water to about 50%. Since I only plan on filling it halfway would it be safe to remove all bracing from the top of the tank? I bought it second hand and the previous owner has already removed the center bracing since they also only filled it halfway. There is still bracing on either end running from the front pane to the back pane. I'm wanting to remove these 2 bracings if I can. I found the following site that has a safety factor calculator http://www.theaquatools.com/building-your-aquarium. If i plug in 122cm x 45cm x 30cm and a safety factor of 3.9 I get 5mm glass should be used. I have assumed I would only need to plug in a height at the waterline and not the full tank height. is that a correct assumption? Also, do these calculators give a safety factor rating that assumes you do or don't have bracing? So basically my question is, if I'm filling to about 30cm only and I assume my glass is 5mm can I remove all the bracing along the top of the tank and still feel comfortable that my tank will be safe?