So me and my friend both had clear tubes that were turning yellow like if the biocide was staining it somehow (or does that just happen?). So he ordered Mayhems Dyes Dark Blue and we both put it in our systems, enough to make a light blue color, because we didn't want to use too much. But now I'm kinda worried that it will stain the window in my XSPC res/pump combo. Now it doesn't seem to stain at all so far, it seems like if it doesn't want to rub off of the water but will it being in my system for maybe the next 6 months be bad? I feel like this is a stupid question but I can't seem to find anything about it staining that hard thick plastic in my res. I'm not worried about the tubes. Does anything have experience with darker color dyes and thick plastic? I heard someone say that my res isn't good with Mayhems Dyes. Thanks in advanced!