Tetra SafeStart

Set up a new tank on Saturday and added this right after the water conditioner, and by Monday the ammonia reading was already zero. That instant biological filter really does what it says, saved me weeks of cycling.

I was a bit skeptical, but after adding this to my new tank, the ammonia levels stayed low from day one. The water did get a little cloudy for about 48 hours, which cleared up fine. Works as promised for starting a cycle.

The bacteria starter did its job, though the ammonia spike in my tank took longer to level out than I'd hoped. It's fine for a new setup, but don't expect miracles if your water's already murky.