The green tubing was completely coated on the inside with algae, sediment etc. Especially on the intake side. The main reason for the change however was i'm going to get 'lilly pipes' and simply they look better with clear tubing that green'.
The 'troublesome' tubing does not have a brand name, i live in china and it was 2.5rmb per meter 'so around 40 us cents per meter'. However given that it was advertised as being for aquariums and made of PVC
, i thought it would be safe. I've water-cooled computers before using 'tygon' tubing, which is very expensive and is used in the medical/beer brewing industries. Even that tubing had a plastic smell to it, so at first I wasn't concerned that this tubing has a strong 'scent' to it before using it. In a computer system, some plastic leaching is normal which would build up on water blocks etc. But after just 12 hours plastic residue is visible on the glass... this is some seriously low quality tubing that I used. By comparison, a computer cooling loop runs warmer than 26c and takes months for this to occur.
I have now ordered some ADA 12/16 tubing, apparently non-toxic, no smell and made from acrylic. However my main concern is, if I've introduced toxins into the tank, there's no way of knowing if they are completely gone. I honestly do not know what to do at this point. Even a 100% water change might leave residue toxins on rocks, plants etc, not to mention inside the filter.
If anyone has any suggestions please offer me some advice. I feel quite guilty about this, killing these fish and potentially turning what was a thriving tank into a toxic wasteland. If you smell the tank, the surface of the water smells like chemicals/plastic/petrol.
I did some research and PVC
shouldn't be toxic to fish, but i'm in china and as some of you might know, quality control isn't the highest priority here.