Thanks for the comments!
I have a waterfall, shown in the 3rd picture. It is small, but trickles into a little pool area. I built it into the background which IS great stuff (insulating foam), silicon, and coco bedding. It was a LOT of work, but it's totally worth it in the end. I just got a 50 liter bag of the hydroton for 40 bucks, and used about 1/3 of it. I think you would probably use 2/3 of a big bag, so it would be your best bet.
I'm having a little trouble with blue mold growing on a bit of the wood - have you guys had this problem ever? Is it dangerous to the enhabitants?
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