I meant mention that when I measure the water quality there's nothing
that appears to be out of order (not measured it since last summer).

What tests are you performing and what are the results? Besides ammonia &
nitrite, what's the pH and KH? Water temp? ~ jan


See my ponds and filter design:
http://users.owt.com/jjspond/

~Keep 'em Wet!~
Tri-Cities WA Zone 7a
To e-mail see website