Thanks for the tip. So far slime has not been an issue, but may become one after I have been dosing for a while and bacterial reproduction really takes off. I will keep that in mind!I will be picking up a bottle of vodka also - but will not be using it in the tank. BTW - one thing you can do - about slime - since you're already doing water changes is - 1) either turkey baste it off or 2) siphon it out with water changes. Other non-slime producing bacteria will still grow - but you will gradually get rid of the slime