I don't understand what you are asking either. Will they look bad? Maybe, but I have em. (Personal preference as to what you like. This will probably stir up alot of stuff from true 'reefer's', I have life rock, fish and plastic plants. Heading towards corals, but didn't, PERSONALLY, like the way it looked with just rocks and fish. It's like decorating your house....your walls might be purple, your neighbors might be white....who cares...it's about you. I personally don't like the rocks and fish only...but think it's wonderful for those who do.)
Will they hurt the tank? No, they won't.