Your decorations sound fine. I would reconsider switching out the fish you have in the tank though. Electric blues and yellow labs are african cichlids, and the oscars are South American cichlids. Cichlids from different sides of the world generally don't mix very well. The africans are usually much more aggressive. They're basic needs are also quite different. Oscars are basically carnivores, and a lot of the africans are mainly veggie eaters. Although most fish will acclimate to your water, the africans prefer a higher ph, and the oscars, a lower one. Would it be possible for you to separate these fish with 2 new tanks? An african community tank would be awesome, and a 200 gallon oscar tank with 4 oscars in it would be stunning! Here's a link to some cookie cutter set ups for cichlids:
http://www.cichlid-forum.com/article...rence_list.php