i wouldnt say so, some oscars dig them up some dont touch them. my friend and i both have oscars that dont touch our plants but we have fake plants. i all depends on the oscar
oscars dont like the taste of java fern, so id try that, besides attaching it to a peice of wood or rock itll do fine just floating, other than that your other option is fake plants or trial and error with costly real plants
my friend has 2 or 3 (cant remember) oscars in a 125
When he had a silver arowana in there (BIG one) the oscars paid no attention to the plants because they feared the arowana (at least thats what we thought)