we used the concrete to form a base to put everything on top of - that way I didn't have to dig down the full 2 feet and we could have a 2 tiered system
we raised the whole upper pond by about a foot.
and yes, I have some smaller koi and goldfish in the small pond and my bigger koi are in the top pond.
right now, they all hide because they are used to being in my garage..
once they start showing themselves, I will post some pics of them.
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Way too much time and money has gone into this hobby....and yet, I CAN'T STOP
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