Thanks for all the replies!!!

The product that I picked up when I first bought everything and setup the tank was chlorhexidine based. It was just a tiny little bottle and only had enough to clean for the initial setup. I spoke to one of the Animal Hospitals today too (where I take my dog) and brought this topic up while I was on the phone and they also suggested chlorhexidine based products or bleach mixtures in limited use and limited amounts.

Happy Cleaning - and kudos to you guys/gals who have to clean so many tubs/tanks. Between my turtle, fish and snake alone it feels like a lifetime of constant cleaning! =)