I agree. I'm new and i have a 29 bio cube, and I got the 25-55gal cleaning crew a month ago, and I didn't realize the impact it would have in my tank. My Nitrates, and Nitrites spiked, and over the last month I lost almost all my turbo snails and scarlet hermits. I haven't been able to stabilize the bio load since, but its slowly coming around. Get a little at a time and see what works for you. I personally love the nass snails!