The 3 footers actually had plates siliconed in the bottom to cover holes previously drilled for bottom drains and the base has cracked on one and the 4ft's front pain cracked when the removed the sump pipe so the only option left is the 6x 2ft which was my original idea anyway.
Bit of a sickener as I had decided on option 3 but Ive got 6 extra tanks now instead of 5, I am sure I will cope
