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RE: RUGF
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
fish?
Good Luck!
Julius Odian