What size enclosure do you have? I prefer wood ones (that have plastic laminate on them) because then you can screw things into them and they are still water proof, but you need to silicone the edges. Waterfalls can get kinda of pricey. Depending on what size tank your seting up, plants can cost quite a bit too. I have spent well over $200 on plants for a 140gal, and then there was all the other stuff to go with it. However you can do it so its pretty cheap, im my opinion its all in what type/size plants you want. Hope this helped.
kyle
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