Umm I really cannot remember much as I havn't played the game for a long time and my snes is at a friends till sunday. I remember having to push a block so that you can jump over a gap but it could be for another part of the tower

Umm looked at a walkthrough and found this if it helps

----Focus Tower (16)
Access the Focus Tower by going north at the Libra Temple. Skip all
Battlefields for the time being. Go downstairs at the first opportunity.

--2F
Talk to the weird cloud guy. He'll tell you to look for Reuben and points
to the statue. Blast to door and get the Venus Shield. Push the statue
two spaces left, 5 down, and 5 more left. Continue left to get the
Blizzard Spell. Exit the Tower and re-enter using the other entrance. Go
downstairs.

--1F
Go back to the left, through the yellow door and open the blue one. Go
upstairs, then down. Jump across the statue you moved, then go left and
up the stairs you find there. On floor 3F, exit the Tower.

Sorry all I can do ftm