Had my fish on this stuff for about 2 months. They increased size fairly rapidly considering their age, but it gave them the aquatic equivalent of the runs. The water quality dropped gradually over time (I generally run very clear water), and tried changing many different things (I know, I should have changed the food first, but money was tight and I wanted to exhaust other options first). Switched back to the old more expensive stuff I used to use and the water was clear again in two days, no joke. The day I switched I took some water samples and the particulate in the water was incredible, all from this food.... Its been a week since I switched, and the fish seem ok, so maybe use this stuff to boost size, but I wouldn't recommend it to anyone that likes their water clearer then not.