my viv is going to take forever to grow into itself though

--------------------------------------------------------------------------------It will take less time than you may think. The oak leaf creeping fig, (Ficus pumila quercifolia) will indeed cover your entire background. I have several tanks in which it forms a solid wall of leaves. If not controlled, it will also grow all over the glass. I think it is one of the most useful background covering plants there is, as it still allows bromes and incidental ferns to grow through it. My cork bark backgrounds almost always grow some kind of epiphytic ferns "spontaneously." These are of two distinct species, but I have no idea exactly what they are.
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Patty
Pahsimeroi, Idaho

Dendrobates: auratus blue, auratus Ancon Hill, tinctorius azureus, leucomelas. Phyllobates: vittatus, terribilis, lugubris. Epipedobates: anthonyi tricolor pasaje. Ranitomeya fantastica, imitator, reticulata. Adelphobates castaneoticus, galactonotus. Oophagia pumilio Bastimentos. (updated systematic nomenclature)