I just wanted to give a snappy review of the Tetra SafeStart Bacteria additive. I purchased this when I was setting up my 3rd fish tank to try and help the cycling process (It's a 20G tank). Well I already had some Zebra Danios in there for "fish in" cycling since I heard those are really bullet proof fish. The ammonia hopped up to around 1.0 ppm and I said the heck with it and bought some of the Tetra SafeStart. I've tried another brand on a 10G tank called API QuickStart (Complete snake oil by the way, we'll get to that in a bit though.)
I added the SafeStart and waited about 24 hours and checked my nitrates and nitrites and surprisingly it was already starting the cycle. After 72 hours the tank was completely cycled, yes I know I'd be skeptical too? I was actually really surprised that this additive worked since I had tried QuickStart which advertised the EXACT same thing that SafeStart supposedly does. The QuickStart didn't boost the cycle one bit actually, the ammonia stayed the same but hey no nitrifying bacteria as it claimed.
IIRC though the SafeStart formula was actually owned by the folks who made Bio Spira? and then was sold to Tetra.
I was skeptical when I read the reviews of SafeStart originally because I read some good and some bad. Alot of the bad reviews though was user-error. Like one guy added it to his tank and claimed it killed all his fish. Come to the full story he had really changed water and added no water conditioner and bloop there goes all his fish.
Anyhow, I don't know how many people prefer a natural cycle or the quick cycling way but I was ready to get the 20G tank up and running so I could give the Danios back to my LFS. The stuff worked for me and hey guy's it's like 14 bucks for a 250ml bottle (Treats up to 70G) so it's not going to break the bank to give it a shot if you want. While YMMV it did work wonders for me and I'd like to hope if anyone else DOES decide to get it that it'd work for them too.
The QuickStart stuff is snake oil in my opinion though and isn't worth a penny. I bought it and it showed no results period and I wouldn't recommend this stuff.
Feel free to comment/discuss!