Hoses will only transfer chemicals into the water if it sits stagnant in the hose. If you flush the hose for several minutes before using it in a tank, you should be fine.
You cant use PVC!? Ugh. I have had a PVC tube in my 55g tank for about 6 months. I got it for my weather loach. The fish seem fine. Should I take it out?
If the hose is flushed, should be ok. I on the other hand, bought a potable water hose last weekend. The hose is so stiff its a little more difficult to use, but its gotta help da fish.