I recently lost a 20 gallon of F. gardneri and Gambasia. Wasting and swimming in place. I did large water changes. Some of the Gambasia suvived when moved to another tank. How to I sterilize the 20? Do I toss the sand and plants? Thanks, Wayne To join the AKA see http://www.aka.org/pages/join.html Archives are at http://fins.actwin.com/killietalk/