OK so I am using BRUTE containers for Salt Water and RO/DI storage. The RO/DI storage is fine but my Salt Water Storage bin is getting a Redish Brown thin Slime on the inside? I have a small pump in there to keep it stirred and a heater to keep it around the same temp as the tank. I am getting what looks like Diatom Algae on the substrate in my tank and now I am wondering if that is the cause? The Salt Water Storage has a lid so it gets no light. Has anyone else experienced this and is there a way to prevent it? I have only had these starage bins for maybe 4-5 months.