heating ponds

we still havent had a hard frost yet so the veggie filter is up and running. but the
temp of the water plummets so early that I been playing around with different ideas
to keep the temp up. I turn down the pump to the veggie filter whenever the air temp
is lower than 55o. turn it up full when it is warmer. I also bought a 500watt
heater from aquatic, may buy the 1000 watt as well. What I want to do is keep the
water temp up until Dec. and then let the fish go "dormant" and drop in the heaters
again in March so the fish are "down" for only 3 months instead of 6 months. and
when the temp comes up in march it STAYS up keeping their immune system working.
Ingrid


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