I took it all apart and am now using my old Hyper 212 Plus.
The tubing is cloudy and yellow but the water is just cloudy (I kept a small sample). The water and the res smell fine, I think. I will rinse in distilled water and white vinegar this week sometime and then buy some more tubing since mine is stained.
I haven't actually opened it up yet. It's late at night here in South Africa and so I will do that tomorrow. If there is some sort of build up of gunk or something what should I do? Clean it with distilled water and vinegar or what?