How do I keep a 15 gal quarantine/feeder tank cycled. I doesn't always have fish in it. How long will it stay cycled with no fish? BTW right now I am using a AC 50 for filtration.
If you have another tank with a wet-dry, remove the bio media from the AC and place it in the sump to keep it cycled. You could just throw the bio in a tank also. That's what I do.