I have built a few PVC overflows and on my big tanks the black PVC is fine. However I have a small tank that I have build an over flow out of 1/2 inch PVC and the only color you can get that in is white (which stands out like a sore thumb). Is there a type of paint that I can use to paint this PVC which will be safe for inside the tank once it's dry? Thanks in advance for any help