the greatest risk to fish for low oxygen is
1. pond water is hot, less oxygen dissolves in hot water
2. the pond is full of green algae (well maybe green plants too)
3. big fish (big fish suffer first)
4. poor aeration

if you absolutely, positively want to make damn sure there is sufficient oxygen get
an aquatic ecosystem whitewater regenerative blower ($179) or their swee****er
(around $379) and a foot long air stone for every 1000 gallons.
Ingrid


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List Manager: Puregold Goldfish List
http://puregold.aquaria.net/
www.drsolo.com
Solve the problem, dont waste energy finding who's to blame
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Unfortunately, I receive no money, gifts, discounts or other
compensation for all the damn work I do, nor for any of the
endorsements or recommendations I make.