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[APD] re: Co2 indicator

I got one of the Dupla indicators after a near disaster in my 55 gallon
tank.  I tweaked the needle valve setting without carefully checking the
bubble rate.  Had a lot of gasping fish.  Now I have the dupla indicator
that I can easily check whenever I am in the room.  And my wife can tell me
if something is wrong with it.

Bob Alston
BobAlston9 at AOL_com


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