I slide my prints from the fix into a tray of water and then transfer them to the wash tank. Lately, I've noticed a light haze forming in the wash tray after several prints have gone thru. The last time the tray stood full overnight and I noticed the haze was settling to the bottom. I don't think it is a problem because the print goes from there to a moving water wash and I doubt anything is left on the print. But I am curious about what's going on. The paper is Ilford MG IV RC and the fix is common Kodak something. The water is chlorinated well water, probably a little acidic, and maybe some iron, although it is not evident.