DIY Base gone wrong? Help plz before big crack

[descarte8]

this and having one continuous surface is always better than having two combined. If you must do this, at least have sheets of continuous plywood under the entire tank to relieve the potential stress points.

theres 1" thick polystyrene then 3.5meter 2" thick kitchen worktop as a continuous surface, polystyrene then tank, i gave my self a 50:50 chance it wouldnt brake. im hoping to improve them odds

 

[descarte8]

I have three very large 260, 360 & 150 gallon tanks in my garage that all slope to one side. I'm unsure on the grade or slope difference but it makes a few inches differance in the water level from one side of the tank to the other. I have had all these tanks up and running for over a year and no brakes or problems... I would spend the time to level them out if I weren't just renting but since it's temporary I live with it.

The trouble i have is the slope isnt even, 2 halfs at different gradients and creates (i think) a gap in the middle of the base with no (or less) support