Originally Posted by Heisenberg 1wt per gallon is a minimum. Pumps should always be running 24/7. Keeping your water oxygenated is a constant battle, and will become harder once you have microbes in there. Proper res conditions should be your first line of defense against disease, and that means never letting the water go anaerobic. Remember proper res conditions are: 1wt per gallon air pump multiple air stones water temps 68-75 Zero light leaks Zero organic material ...