Koi question

I live in miami fl. im building a 175 gal waterfall pond but can go only 20 inches deep. I have morning shade?
Question: I am concerned about the temp for goldfish or koi in summer. I have a concrete pond I bought as a foundation. It's only 45 inches round and 8 in deep, so I plan on dropping it under ground 1 foot and adding 1 foot around the circumference. This should take its original size of 65 gallons and add about 100 gallons more making it about 165 total make any sense got any ideas?





Answer: Your fish will be fine at 20". I would stick to goldfish rather than koi, tho, because koi need at least 3' of water depth. Cover 60% of the top of the pond with floating vegetation and put in one bunch of submerged vegetation per square foot.


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