Hi everyone I’m new to this site not new to the hobby but I’m taking on a new project by building my own tank I’m going to be building a indoor cement tank with viewing windows on to sides first dimensions ideas would be 60x48x60 (L W H) so I believe this would be around 750 gallons I’m kinda stumped on how thick the windows should be and what material to use as the windows if anyone has any ideas I’d love suggestions thanks