Take the fish out before you start moving the rock or you'll defeat the purpose of moving them/keeping them in 'cleaner' water.
Who said you have to glue the rock?
If you take your time and start with a good foundation of rock (at the very bottom of the tank -- as in on the glass) you should be able to stack your rock so that it doesn't wobble. You can angle it toward the rear wall for additional support.
If you don't have enough rock to make the aquascape you want..build it to whatever level you can with what you have and add more to the top in the future.
Which design did you decide on..the 'c' or the 2 structures? Or another one?
Who said you have to glue the rock?
If you take your time and start with a good foundation of rock (at the very bottom of the tank -- as in on the glass) you should be able to stack your rock so that it doesn't wobble. You can angle it toward the rear wall for additional support.
If you don't have enough rock to make the aquascape you want..build it to whatever level you can with what you have and add more to the top in the future.
Which design did you decide on..the 'c' or the 2 structures? Or another one?