Hello! We "rescued" two gold fish from a fair (yeah, I know - not the best) about 4 weeks ago. Initially, they were living in a 2.5 gallon tank with a filter. The other day, I noticed the one fish was turning back, which I learned was ammonia burns healing. Enter 20 gallon fish tank! I learned via the web and this forum that cycling should have happened, but given the conditions they were in, the small filter and space couldn't keep up with them. They were put into the new 20 gallon tank last night. No items from the smaller tank went into the new tank due to the bad conditions. We started the small tank using Tetra AquaSafe, but have switched to Prime for the new tank (we use prime for the hermit crabs that were "rescued" the same day). So, the new tank - all items were rinsed with tap water, then allowed to soak in a bucket of water treated for prime. Gravel and items placed in new tank - tank filled and then treated. Fish transferred shortly thereafter. After reading a thread on this forum, Tetra SafeStart Plus was added to the tank this morning (12 hours after fish transferred to new home). We also have the API test kit. Currently, nitrite/nitrate are zero, but my ammonia is still not right (between .25 ppm and .50 ppm - color was sort of in between). The pH is 7.6 (do I have to use the high range test too?? that was 7.4). Do I need to do something about the ammonia level or give the SafeStart more time to work? The filter that came with the tank is an Aqua-Tech Power Filter, model 10-20. It says he has a carbon filter that needs to be changed every two months, but I've read that changing filters disrupts the good bacteria in the tank......confused on this. The larger fish - his fins are pretty black - I feel horrible that this happened to him, but he definitely seems much happier in the larger tank. The smaller fish - has a few black spots on him, but this afternoon I noticed that the tip of his tail is clear - is this something I need to be concerned about? Do we need to add any sort of algae eater to the tank? Even though we were kind of thrown into ownership - I definitely want to give these little guys the best life I can (I feel bad for all of my former goldfish that I had as a child - they were kept in bowls - yikes!). Also, any suggestions on how to keep the larger fish from hogging all the food?? Thanks so much!