hello folks i am going to be building a 240 gallon aquarium with the demonsions of 4x4x2 it's gonna be a 4 ft sq and 2 foot tall. Ok back to the point i was wondering for this aquarium what thickness of acrylic i should use and also what silcone would hold for this might tank. Also how much the acrylic is gonna run me per sq feet. Any help is much aprreciated!