i've used black krylon fusion in a malawi cichlid tank on plastic rain gutters for making multiple levels of caves. i never lost a fish or noticed any adverse effects from the paint. I painted two coats and let it dry for over a week, and then soaked and rinsed and soaked and rinsed before finally decided to stick it in the tank. it seems that krylon fusion is fish safe, but i can't speak for any other spray paints. this stuff also works fairly well on pvc, but be sure you sand it with a COARSE sandpaper first to give it something to adhere to, because it really doesn't stay on pvc well without the surface being rouged up a bit.
Eheim Pimp #171
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