http://www.petsupplies4less.com/i_01601 ... .17+gm.php
and another one in Kansas:
http://www.valleyvet.com/ct_detail.html ... b0d0204ae5
this is the product I have.
hth

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Here's a link to an aquarium volume calculator just in case you're not sure of your tank volumes.65 gal....footprint 36 X 18
http://www.angelfish.net/tankvolcalc.php