Let me start by saying, if you're setting up a saltwater aquarium, DrTim's One & Only is a must-have. I've tried various cycling methods over the years, from the 'throw in a dead shrimp' approach to other bacterial starters, but nothing compares to this product.

The magic happens immediately. Unlike traditional cycling that can take weeks, I added fish to my new tank within days of using One & Only. My clownfish and anemone thrived right from the start - no ammonia spikes, no stressed fish. It's like having an instant biological filter.

What really impressed me was how it completely skipped the dreaded 'ugly phase' most new tanks go through. No excessive algae blooms or cloudy water. My corals (birdsnest and montipora) were happy campers too.

The 64oz size is perfect for larger tanks - I used it on my 100+ gallon system with great results. The product claims to work instantly, and in my experience, it absolutely does.

Now for the reality check: while most users (myself included) had fantastic results, a small percentage report it didn't work for them. This might depend on other tank parameters or setup conditions. Also, it's not an algae remover - don't expect it to solve existing algae problems.

Pro tip: Keep an extra bottle on hand for emergency situations like setting up hospital tanks quickly. The peace of mind is worth every penny.

Bottom line? If you want to set up your saltwater tank the scientific way (not the 'voodoo' way), DrTim's One & Only delivers real, measurable results backed by marine biology expertise.