For those of you with indoor ponds, does it affect the humidity a lot? My basement is noticeably more humid from my 210 gallon open-top tank. I am considering an indoor pond, but of course I'll have to wait until my sister moves out so I can use her bedroom as a fish room. 
What do you use as underlayment beneath your indoor ponds, if anything?
I have a large outdoor pond, don't know how many gallons but it's pretty big - maybe between 5000 and 10000 gallons? I had feeder goldfish in there until I brought them inside for the winter, and my prawn ended up eating all of them.

What do you use as underlayment beneath your indoor ponds, if anything?
I have a large outdoor pond, don't know how many gallons but it's pretty big - maybe between 5000 and 10000 gallons? I had feeder goldfish in there until I brought them inside for the winter, and my prawn ended up eating all of them.
