Starting tomorrow, I will be housesitting for my mother-in-law for a week. I know my fish will be fine without being fed, although I had planned to come home and feed them once every two or three days. My question is on my empty tank. I established a fishless cycle and have been feeding ammonia daily until I find the right fish for the tank. Do I need to come home and put ammonia in daily or will it survive on every 2-3 days? Oh, and don't worry about the fishies, I did an 80% change on their water today and plan another for tomorrow just so I can be sure they have very clean water before I leave them unattended.