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Once concern I would have about using a reverse undergravel filter in 
a pond is that the strainer in front of the powerheads might get 
clogged with debris. Are there trees or leaves that will end up in 
the pond? Furthermore, just organic matter such as dead leaves from 
plants and so one might be problematic. As far as tropical fish go, 
is the temperature stable enough and does it remain constant in the 
winter too? Also, this is more speculative but might birds eat the 

Good Luck!

Julius Odian