So i was in lowes the other day and found myself in the pvc section and decided to buy some pipes and caps to make two columns for my tank. My initial idea was to glue gravel to them but needless to say I'm quickly abandoning that mission, I've scrubbed the pvc with course grit sand paper and got the pvc nice and clean but dont want to put them in the tank just plain white any suggestions would be greatly appreciated. thought about painting, but not sure about using paint in my tank