I use the river pebble size in our indoor pond, it only houses a couple turtles and maybe 2 goldfish if the turtles don't eat them. It was used for asthetics mainly as my son wanted it, I personally would not use it. I'm becoming a believer of no bottom substrate in any pond or tank, I really only substrates in my indoor aquariums for looks.
I don't and wouldn't use any substraight in my basement pond. I keep large numbers in it. I merely have my filtration returns directed in such a manner that almost all fish wastes collect in a corner of the pond. an aquarium net on a pvc handle allows me to scoop out all the wastes in a matter of less than a minute. I have about 100 koi in it at present. and have kept as many as 230 in it for 7-8 months at a time.
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