Okay so I filled my new 90g with fresh water to check for leaks and noticed that it's not quite level....floor must be unlevel!!! It's about 1/2 inch off. Do I need to level it up and if so how? It's sitting on a standard 90g wooden stand that's sitting on the tile floor of my living room! I'm hopeing to get it filled with salt water in the next 2 weeks....it's been a long time coming!