I'm looking for help. I'm putting together a 55 gal aquarium for a green basilisk an want to seperate it in thirds. One third a lake with a waterfall the other two thirds will be planted area with a two foot rise in tank for climbing.My problem is how to dam up (natural looking) the water side.I'm at a block any suggestions or how to viedos are welcome.I'm bored with just a large water bowl. I'm also (near future) going to do same in two 100gal tanks i have. Thank you in advance