I have been doing a fishless cycle for 6 weeks and I'm stumped!!! Haven't had to add much ammonia since the start because it keep testing above 4ppm. Started using fish food, then switched to pure ammonia but only had to add it a couple of times. A couple of days ago I got antsy and added a bottle of SafeStart to my 26 gallon tank.. Tested today, ammonia still high and no signs of nitrites at all!!! Stuff in tank getting coated with white fuzzy looking film. I'm about to give up but my granddaughter goes to the tank every time she comes through the door pointing and yelling " Bish! Bish!(she's 18 months) and taking her to Petsmart to visit the fish is getting old!!! What can I do???