What would you say is the most humane way to kill fish? I'm switching my 280 over to salt water and i have to get rid of about 25 Natterii. Unfortunatly being in Florida i cannot sell or give them away. Nore am i willing to dump them in a pond or river. so what to do? i have had them since they were the size of nickels and now they are all about 5-6". I was thinking of just turning off the filter and letting them drown. any better ideas?