Thanks a lot but I am asking for their maximum length when I HAVE to change the tank because a 180 gallon here costs more than $800 (it comes with everything of course), I can get one custom made at a glass shop and buy the light, filter, table etc. separately and that would be far cheaper, The problem is I do not think it would be lined with plastic ( probably will be made of pure glass) as my current one and I do not think it would be as stable. With the partition they have about 50cm of the tank each right now (1 metre total). My tank is a sun-sun [FONT='Times New Roman','serif']HRC-1040B and its specs are :[/FONT]
[FONT='Times New Roman','serif'][FONT='Times New Roman','serif']Size(L*W*H)[/FONT]:[FONT='Times New Roman','serif']1029*455*584mm
Volume(L)[/FONT]:[FONT='Times New Roman','serif']185
Lamp Power[/FONT]:[FONT='Times New Roman','serif']3*39W(T5)
Filter Pump[/FONT]:[FONT='Times New Roman','serif']HQJ-900G 12W[/FONT][/FONT]