Ok update lol
as you know i scraped all silicone from inside up to higher then water level can possibly be, then put more silicone then i probably should have, after waited for it to dry out and filled tank with water, higher then water level will be.

Right now, 48 hours after it is NoT leaking, meaning with your help i finally did smth right! ��
so i just took all water out, wait a little bit to it to dry and then full on with false bottom and the foam!