I have used DrTim's. I normally do not need bacterial starters since I run about 18 tanks. I can always steal media and also have a rubbermaid filled with excess plants. I used DrTim's to start a tank that I needed to get cycled for a pH of 6.5 fairly fast. I could not use media from other tanks as I was receiving wild caught angels that come from acid waters. I needed to insure I had no disease type bacteria in the tank so could not risk using mature media/substrate from other tanks. I also had some time constraints so I needed to be able to accelerate the rocess.
How long after using the DrTim's product did you feel it was safe to add your fish? How about the Tetra product?
Thanks
Steve