Bath been filled and no leaks.

We have filled the bath up with water and left it over night to see if we had any leaks, all ok at the moment so the tub is full of water now. I've put some bricks and half a slab and some wood in the tub,just incase anything falls in at least they is something for them to climb onto to get out ( hope it works).Now I need to sort some plants out to put in the tub and do something for around the tub. I should of double checked the tub before i filled it because it's not straight, I know it doesn't if it's straight or not, it's for the wildlife to use and not me.