im having this thoughts of making a 10x3x3ft plytank.. as i would to expand my knowledge to this... what type of materials do i need and thickness of glass and wood do i require.. so as a mate told me to use a brand of sealant called G4 Pond seal.. is there any alternative on this.. plus could someone direct me on a step by step build up of the "plytanks" as i tried to search this but i cant find it.. could some one please help me .. many thanks!!!