In my 40 gal. QT<HT> tank I keep PVC pieces to provide fishes with hiding places and make them more comfortable. I saw some nice artificial coral pieces on internet. Would that be ok to buy couple of them or they will interfere and absorb the Copper and make more difficult to maintain proper Copper level. I keep that tank in my Family Room also and it would be nicer to look at those instead only PVC pipes...Thanks.